Omnisharp doesn't work at all in Emacs 28.1

[EmilyGraceSeville7cf]

I don't know why it doesn't work as expected. I've done the following steps:

1. add omnisharp to my packages variable in ~/.emacs
2. M-x load-file RET ~/.emacs
3. dotnet new console --name Test
4. dotnet new sln --name Test
5. dotnet sln add ./Test/Test.csproj
6. git init
7. emacs -nw ./Test/Program.cs
8. M-x omnisharp-install-server
9. M-x omnisharp-start-omnisharp-server
10. M-x company-mode RET

Note that I've tried to build project via dotnet build after no completion appeared and restarted Emacs with 7-10 steps repeated with no result...

No completion is shown for Console.. I wanna manually start omnisharp server to check whether it works and after it hook it start to opening C# files.

My ~/.emacs is:

(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)

(setq packages '(soft-stone-theme flycheck markdown-mode json-mode yaml-mode format-all lsp-mode csharp-mode omnisharp lsp-pyright company))

(dolist (package packages)
  (package-install package))

(add-hook 'after-init-hook (lambda () (load-theme 'soft-stone t)))
(add-hook 'after-init-hook #'global-flycheck-mode)

(custom-set-variables
 ;; custom-set-variables was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 '(display-line-numbers 'relative)
 '(package-selected-packages
   '(omnisharp csharp-mode company lsp-pyright lsp-mode format-all yaml-mode json-mode markdown-mode flycheck soft-stone-theme)))
(custom-set-faces
 ;; custom-set-faces was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 )

The last failed attempt to fix this problem was adding:

(setq omnisharp-expected-server-version "1.32.0") ; https://github.com/OmniSharp/omnisharp-vscode/issues/1450#issuecomment-432516876
(let ((dotnet-version (string-trim (shell-command-to-string "dotnet --version"))))
  ;; https://github.com/OmniSharp/omnisharp-emacs/issues/459#issuecomment-452656947
  (setenv "MSBuildSDKsPath" (format "/usr/share/dotnet/sdk/%s/Sdks" dotnet-version)))

right before custom-set-variables. I restarted Emacs, M-x omnisharp-start-omnisharp-server asked me to install omnisharp server (again?). I installed it, started via M-x omnisharp-start-omnisharp-server but no completion appeared.

Sometimes I obtain Package cl is deprepated error. It seems it happens only at first server start.

[EmilyGraceSeville7cf]

⚠️ omnisharp is installed manually via M-x package-install.

When I change my ~/.emacs config to this one:

(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)

(setq packages '(soft-stone-theme flycheck markdown-mode json-mode yaml-mode format-all lsp-mode lsp-pyright company))

(dolist (package packages)
  (package-install package))

(add-hook 'after-init-hook (lambda () (load-theme 'soft-stone t)))
(add-hook 'after-init-hook #'global-flycheck-mode)

(eval-after-load
 'company
 '(add-to-list 'company-backends 'company-omnisharp))

(add-hook 'csharp-mode-hook #'company-mode)

(custom-set-variables
 ;; custom-set-variables was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 '(display-line-numbers 'relative)
 '(package-selected-packages
   '(omnisharp csharp-mode company lsp-pyright lsp-mode format-all yaml-mode json-mode markdown-mode flycheck soft-stone-theme)))
(custom-set-faces
 ;; custom-set-faces was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 )

and open any ./Test/Program.cs from post above, start omnisharp server it fails with:

[01:52:04] starting server on project root "/home/emilyseville7cfg/Documents/Mine/CSharp/"
[01:52:04] Using server binary on /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/run
[01:52:05] INFORMATION: OmniSharp.Stdio.Host, Starting OmniSharp on ubuntu 22.4 (x64)
[01:52:05] INFORMATION: OmniSharp.Services.DotNetCliService, DotNetPath set to dotnet
[01:52:05] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Located 1 MSBuild instance(s)
            1: StandAlone 17.0.0 - "/home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin"
[01:52:05] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, MSBUILD_EXE_PATH environment variable set to '/home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin/MSBuild.exe'
[01:52:05] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Registered MSBuild instance: StandAlone 17.0.0 - "/home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin"
            CscToolExe = csc.exe
            MSBuildToolsPath = /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin
            CscToolPath = /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin/Roslyn
            BypassFrameworkInstallChecks = true
            MSBuildExtensionsPath = /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "Could not load signature of Roslynator.CSharp.SyntaxWalkers.CSharpSyntaxNodeWalker:VisitFileScopedNamespaceDeclaration due to: Could not resolve type with token 01000129 from typeref (expected class 'Microsoft.CodeAnalysis.CSharp.Syntax.FileScopedNamespaceDeclarationSyntax' in assembly 'Microsoft.CodeAnalysis.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35') assembly:Microsoft.CodeAnalysis.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 type:Microsoft.CodeAnalysis.CSharp.Syntax.FileScopedNamespaceDeclarationSyntax member:(null)"))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "System.TypeLoadException: Parent class vtable failed to initialize, due to: VTable setup of type Roslynator.CSharp.SyntaxWalkers.CSharpSyntaxNodeWalker failed assembly:/home/emilyseville7cfg/.vscode/extensions/josefpihrt-vscode.roslynator-4.1.1/roslyn/common/Roslynator.CSharp.dll type:CSharpSyntaxNodeWalker member:(null)"))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at (wrapper managed-to-native) System.RuntimeType.GetPropertiesByName_native(System.RuntimeType,intptr,System.Reflection.BindingFlags,System.RuntimeType/MemberListType)"))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.RuntimeType.GetPropertiesByName (System.String name, System.Reflection.BindingFlags bindingAttr, System.RuntimeType+MemberListType listType, System.RuntimeType reflectedType) [0x0001b] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.RuntimeType.GetPropertyCandidates (System.String name, System.Reflection.BindingFlags bindingAttr, System.Type[] types, System.Boolean allowPrefixLookup) [0x00010] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.RuntimeType.GetProperties (System.Reflection.BindingFlags bindingAttr) [0x00000] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Reflection.RuntimeReflectionExtensions.GetRuntimeProperties (System.Type type) [0x00014] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.Discovery.TypeInspector+<DiscoverPropertyExports>d__7.MoveNext () [0x00030] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.Discovery.TypeInspector+<DiscoverExports>d__5.MoveNext () [0x000dc] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.Discovery.TypeInspector.InspectTypeForPart (System.Reflection.TypeInfo type, System.Composition.TypedParts.Discovery.DiscoveredPart& part) [0x00061] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.TypedPartExportDescriptorProvider..ctor (System.Collections.Generic.IEnumerable`1[T] types, System.Composition.Convention.AttributedModelProvider attributeContext) [0x00037] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.Hosting.ContainerConfiguration.CreateContainer () [0x00042] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at Microsoft.CodeAnalysis.Host.Mef.MefHostServices.Create (System.Collections.Generic.IEnumerable`1[T] assemblies) [0x00031] in <2b89d626687148ba8fbf92b75d65cebf>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.HostServicesAggregator.CreateHostServices () [0x00000] in <3c22014bb8b9403ba6b94645d03f0cd7>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.OmniSharpWorkspace..ctor (OmniSharp.HostServicesAggregator aggregator, Microsoft.Extensions.Logging.ILoggerFactory loggerFactory, OmniSharp.FileWatching.IFileSystemWatcher fileSystemWatcher) [0x00046] in <3c22014bb8b9403ba6b94645d03f0cd7>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at (wrapper dynamic-method) System.Object.lambda_method(System.Runtime.CompilerServices.Closure,System.Composition.Hosting.Core.LifetimeContext,System.Composition.Hosting.Core.CompositionOperation)"))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.ActivationFeatures.DisposalFeature+<>c__DisplayClass0_0.<RewriteActivator>b__0 (System.Composition.Hosting.Core.LifetimeContext c, System.Composition.Hosting.Core.CompositionOperation o) [0x00000] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.Hosting.Core.LifetimeContext.GetOrCreate (System.Int32 sharingId, System.Composition.Hosting.Core.CompositionOperation operation, System.Composition.Hosting.Core.CompositeActivator creator) [0x000a8] in <8e026c716fc84f38aae28085eaaee9fc>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.ActivationFeatures.LifetimeFeature+<>c__DisplayClass1_0.<RewriteActivator>b__0 (System.Composition.Hosting.Core.LifetimeContext c, System.Composition.Hosting.Core.CompositionOperation o) [0x00011] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.Hosting.Core.CompositionOperation.Run (System.Composition.Hosting.Core.LifetimeContext outermostLifetimeContext, System.Composition.Hosting.Core.CompositeActivator compositionRootActivator) [0x0001c] in <8e026c716fc84f38aae28085eaaee9fc>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.Hosting.Core.LifetimeContext.TryGetExport (System.Composition.Hosting.Core.CompositionContract contract, System.Object& export) [0x0001d] in <8e026c716fc84f38aae28085eaaee9fc>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.Hosting.CompositionHost.TryGetExport (System.Composition.Hosting.Core.CompositionContract contract, System.Object& export) [0x00000] in <8e026c716fc84f38aae28085eaaee9fc>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.CompositionContext.GetExport (System.Composition.Hosting.Core.CompositionContract contract) [0x00000] in <12675e53c8854b48abd187539ce374db>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.CompositionContext.GetExport (System.Type exportType, System.String contractName) [0x00008] in <12675e53c8854b48abd187539ce374db>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.CompositionContext.GetExport[TExport] (System.String contractName) [0x00000] in <12675e53c8854b48abd187539ce374db>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.CompositionContext.GetExport[TExport] () [0x00000] in <12675e53c8854b48abd187539ce374db>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.Stdio.Host.Initialize () [0x0000d] in <65e0aca433ab4fb4946c0b3fc58fd85a>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.Stdio.Host..ctor (System.IO.TextReader input, OmniSharp.Services.ISharedTextWriter writer, OmniSharp.IOmniSharpEnvironment environment, System.IServiceProvider serviceProvider, OmniSharp.CompositionHostBuilder compositionHostBuilder, Microsoft.Extensions.Logging.ILoggerFactory loggerFactory, System.Threading.CancellationTokenSource cancellationTokenSource) [0x0007b] in <65e0aca433ab4fb4946c0b3fc58fd85a>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.Stdio.Driver.Program+<>c__DisplayClass0_1.<Main>b__1 () [0x0017d] in <eda49c0af257459b858c33bd65a6834a>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.CommandLineApplication+<>c__DisplayClass11_0.<OnExecute>b__0 () [0x0000b] in <02ecf52e50b5487fbf035af7482feffd>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at McMaster.Extensions.CommandLineUtils.CommandLineApplication.Execute (System.String[] args) [0x00039] in <344a1e8cd6594b17b1e01f8df6ae8827>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.CommandLineApplication.Execute (System.String[] args) [0x00081] in <02ecf52e50b5487fbf035af7482feffd>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.Stdio.Driver.Program+<>c__DisplayClass0_0.<Main>b__0 () [0x00028] in <eda49c0af257459b858c33bd65a6834a>:0 "))
[01:52:06] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.HostHelpers.Start (System.Func`1[TResult] action) [0x0001c] in <02ecf52e50b5487fbf035af7482feffd>:0 "))

It doesn't work even when I move:

(eval-after-load
 'company
 '(add-to-list 'company-backends 'company-omnisharp))

(add-hook 'csharp-mode-hook #'company-mode)

to ~/.emacs.d/init.el file. Log for the second case is:

[02:05:40] starting server on project root "/home/emilyseville7cfg/Documents/Mine/CSharp/"
[02:05:40] Using server binary on /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/run
[02:05:41] INFORMATION: OmniSharp.Stdio.Host, Starting OmniSharp on ubuntu 22.4 (x64)
[02:05:41] INFORMATION: OmniSharp.Services.DotNetCliService, DotNetPath set to dotnet
[02:05:41] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Located 1 MSBuild instance(s)
            1: StandAlone 17.0.0 - "/home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin"
[02:05:41] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, MSBUILD_EXE_PATH environment variable set to '/home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin/MSBuild.exe'
[02:05:41] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Registered MSBuild instance: StandAlone 17.0.0 - "/home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin"
            CscToolExe = csc.exe
            MSBuildToolsPath = /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin
            CscToolPath = /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin/Roslyn
            BypassFrameworkInstallChecks = true
            MSBuildExtensionsPath = /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "Could not load signature of Roslynator.CSharp.SyntaxWalkers.CSharpSyntaxNodeWalker:VisitFileScopedNamespaceDeclaration due to: Could not resolve type with token 01000129 from typeref (expected class 'Microsoft.CodeAnalysis.CSharp.Syntax.FileScopedNamespaceDeclarationSyntax' in assembly 'Microsoft.CodeAnalysis.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35') assembly:Microsoft.CodeAnalysis.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 type:Microsoft.CodeAnalysis.CSharp.Syntax.FileScopedNamespaceDeclarationSyntax member:(null)"))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "System.TypeLoadException: Parent class vtable failed to initialize, due to: VTable setup of type Roslynator.CSharp.SyntaxWalkers.CSharpSyntaxNodeWalker failed assembly:/home/emilyseville7cfg/.vscode/extensions/josefpihrt-vscode.roslynator-4.1.1/roslyn/common/Roslynator.CSharp.dll type:CSharpSyntaxNodeWalker member:(null)"))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at (wrapper managed-to-native) System.RuntimeType.GetPropertiesByName_native(System.RuntimeType,intptr,System.Reflection.BindingFlags,System.RuntimeType/MemberListType)"))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.RuntimeType.GetPropertiesByName (System.String name, System.Reflection.BindingFlags bindingAttr, System.RuntimeType+MemberListType listType, System.RuntimeType reflectedType) [0x0001b] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.RuntimeType.GetPropertyCandidates (System.String name, System.Reflection.BindingFlags bindingAttr, System.Type[] types, System.Boolean allowPrefixLookup) [0x00010] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.RuntimeType.GetProperties (System.Reflection.BindingFlags bindingAttr) [0x00000] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Reflection.RuntimeReflectionExtensions.GetRuntimeProperties (System.Type type) [0x00014] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.Discovery.TypeInspector+<DiscoverPropertyExports>d__7.MoveNext () [0x00030] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.Discovery.TypeInspector+<DiscoverExports>d__5.MoveNext () [0x000dc] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.Discovery.TypeInspector.InspectTypeForPart (System.Reflection.TypeInfo type, System.Composition.TypedParts.Discovery.DiscoveredPart& part) [0x00061] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.TypedPartExportDescriptorProvider..ctor (System.Collections.Generic.IEnumerable`1[T] types, System.Composition.Convention.AttributedModelProvider attributeContext) [0x00037] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.Hosting.ContainerConfiguration.CreateContainer () [0x00042] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at Microsoft.CodeAnalysis.Host.Mef.MefHostServices.Create (System.Collections.Generic.IEnumerable`1[T] assemblies) [0x00031] in <2b89d626687148ba8fbf92b75d65cebf>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.HostServicesAggregator.CreateHostServices () [0x00000] in <3c22014bb8b9403ba6b94645d03f0cd7>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.OmniSharpWorkspace..ctor (OmniSharp.HostServicesAggregator aggregator, Microsoft.Extensions.Logging.ILoggerFactory loggerFactory, OmniSharp.FileWatching.IFileSystemWatcher fileSystemWatcher) [0x00046] in <3c22014bb8b9403ba6b94645d03f0cd7>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at (wrapper dynamic-method) System.Object.lambda_method(System.Runtime.CompilerServices.Closure,System.Composition.Hosting.Core.LifetimeContext,System.Composition.Hosting.Core.CompositionOperation)"))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.ActivationFeatures.DisposalFeature+<>c__DisplayClass0_0.<RewriteActivator>b__0 (System.Composition.Hosting.Core.LifetimeContext c, System.Composition.Hosting.Core.CompositionOperation o) [0x00000] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.Hosting.Core.LifetimeContext.GetOrCreate (System.Int32 sharingId, System.Composition.Hosting.Core.CompositionOperation operation, System.Composition.Hosting.Core.CompositeActivator creator) [0x000a8] in <8e026c716fc84f38aae28085eaaee9fc>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.TypedParts.ActivationFeatures.LifetimeFeature+<>c__DisplayClass1_0.<RewriteActivator>b__0 (System.Composition.Hosting.Core.LifetimeContext c, System.Composition.Hosting.Core.CompositionOperation o) [0x00011] in <9aac21a4a3f24063b2b8b59143acddfc>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.Hosting.Core.CompositionOperation.Run (System.Composition.Hosting.Core.LifetimeContext outermostLifetimeContext, System.Composition.Hosting.Core.CompositeActivator compositionRootActivator) [0x0001c] in <8e026c716fc84f38aae28085eaaee9fc>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.Hosting.Core.LifetimeContext.TryGetExport (System.Composition.Hosting.Core.CompositionContract contract, System.Object& export) [0x0001d] in <8e026c716fc84f38aae28085eaaee9fc>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.Hosting.CompositionHost.TryGetExport (System.Composition.Hosting.Core.CompositionContract contract, System.Object& export) [0x00000] in <8e026c716fc84f38aae28085eaaee9fc>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.CompositionContext.GetExport (System.Composition.Hosting.Core.CompositionContract contract) [0x00000] in <12675e53c8854b48abd187539ce374db>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.CompositionContext.GetExport (System.Type exportType, System.String contractName) [0x00008] in <12675e53c8854b48abd187539ce374db>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.CompositionContext.GetExport[TExport] (System.String contractName) [0x00000] in <12675e53c8854b48abd187539ce374db>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at System.Composition.CompositionContext.GetExport[TExport] () [0x00000] in <12675e53c8854b48abd187539ce374db>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.Stdio.Host.Initialize () [0x0000d] in <65e0aca433ab4fb4946c0b3fc58fd85a>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.Stdio.Host..ctor (System.IO.TextReader input, OmniSharp.Services.ISharedTextWriter writer, OmniSharp.IOmniSharpEnvironment environment, System.IServiceProvider serviceProvider, OmniSharp.CompositionHostBuilder compositionHostBuilder, Microsoft.Extensions.Logging.ILoggerFactory loggerFactory, System.Threading.CancellationTokenSource cancellationTokenSource) [0x0007b] in <65e0aca433ab4fb4946c0b3fc58fd85a>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.Stdio.Driver.Program+<>c__DisplayClass0_1.<Main>b__1 () [0x0017d] in <eda49c0af257459b858c33bd65a6834a>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.CommandLineApplication+<>c__DisplayClass11_0.<OnExecute>b__0 () [0x0000b] in <02ecf52e50b5487fbf035af7482feffd>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at McMaster.Extensions.CommandLineUtils.CommandLineApplication.Execute (System.String[] args) [0x00039] in <344a1e8cd6594b17b1e01f8df6ae8827>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.CommandLineApplication.Execute (System.String[] args) [0x00081] in <02ecf52e50b5487fbf035af7482feffd>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.Stdio.Driver.Program+<>c__DisplayClass0_0.<Main>b__0 () [0x00028] in <eda49c0af257459b858c33bd65a6834a>:0 "))
[02:05:41] <-- Received an unknown server packet: ((ServerMessageParseError . "The server sent an unknown json message. Inspect the omnisharp-server process buffer to view recent messages from the server. Set `omnisharp-debug' to t and inspect the *omnisharp-debug* buffer for this error specifically.") (Message . "  at OmniSharp.HostHelpers.Start (System.Func`1[TResult] action) [0x0001c] in <02ecf52e50b5487fbf035af7482feffd>:0 "))

[mateialexandru]

Same issue, on Windows 11, Emacs 28.1

[razzmatazz]

this is most probably random gibberish from omnisharp via stdin that is being interpreted as json.. maybe an error message..

could you run /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/run directly from the terminal? you should see the actual error messages/blurb it is emitting to the stdio

IIRC the arguments to start omnisharp-roslyn in stdio mode is:

• ./run --stdio

[EmilyGraceSeville7cf]

/home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/run produces this output:

{"Event":"log","Body":{"LogLevel":"INFORMATION","Name":"OmniSharp.Stdio.Host","Message":"Starting OmniSharp on ubuntu 22.4 (x64)"},"Seq":1,"Type":"event"}
{"Event":"log","Body":{"LogLevel":"INFORMATION","Name":"OmniSharp.Services.DotNetCliService","Message":"DotNetPath set to dotnet"},"Seq":2,"Type":"event"}
{"Event":"log","Body":{"LogLevel":"INFORMATION","Name":"OmniSharp.MSBuild.Discovery.MSBuildLocator","Message":"Located 1 MSBuild instance(s)\n            1: StandAlone 17.0.0 - \"/home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin\""},"Seq":3,"Type":"event"}
{"Event":"log","Body":{"LogLevel":"INFORMATION","Name":"OmniSharp.MSBuild.Discovery.MSBuildLocator","Message":"MSBUILD_EXE_PATH environment variable set to '/home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin/MSBuild.exe'"},"Seq":4,"Type":"event"}
{"Event":"log","Body":{"LogLevel":"INFORMATION","Name":"OmniSharp.MSBuild.Discovery.MSBuildLocator","Message":"Registered MSBuild instance: StandAlone 17.0.0 - \"/home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin\"\n            CscToolExe = csc.exe\n            MSBuildToolsPath = /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin\n            CscToolPath = /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild/Current/Bin/Roslyn\n            BypassFrameworkInstallChecks = true\n            MSBuildExtensionsPath = /home/emilyseville7cfg/.emacs.d/.cache/omnisharp/server/v1.37.13/omnisharp/.msbuild"},"Seq":5,"Type":"event"}
Could not load signature of Roslynator.CSharp.SyntaxWalkers.CSharpSyntaxNodeWalker:VisitFileScopedNamespaceDeclaration due to: Could not resolve type with token 01000129 from typeref (expected class 'Microsoft.CodeAnalysis.CSharp.Syntax.FileScopedNamespaceDeclarationSyntax' in assembly 'Microsoft.CodeAnalysis.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35') assembly:Microsoft.CodeAnalysis.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 type:Microsoft.CodeAnalysis.CSharp.Syntax.FileScopedNamespaceDeclarationSyntax member:(null)
System.TypeLoadException: Parent class vtable failed to initialize, due to: VTable setup of type Roslynator.CSharp.SyntaxWalkers.CSharpSyntaxNodeWalker failed assembly:/home/emilyseville7cfg/.vscode/extensions/josefpihrt-vscode.roslynator-4.1.1/roslyn/common/Roslynator.CSharp.dll type:CSharpSyntaxNodeWalker member:(null)
  at (wrapper managed-to-native) System.RuntimeType.GetPropertiesByName_native(System.RuntimeType,intptr,System.Reflection.BindingFlags,System.RuntimeType/MemberListType)
  at System.RuntimeType.GetPropertiesByName (System.String name, System.Reflection.BindingFlags bindingAttr, System.RuntimeType+MemberListType listType, System.RuntimeType reflectedType) [0x0001b] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 
  at System.RuntimeType.GetPropertyCandidates (System.String name, System.Reflection.BindingFlags bindingAttr, System.Type[] types, System.Boolean allowPrefixLookup) [0x00010] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 
  at System.RuntimeType.GetProperties (System.Reflection.BindingFlags bindingAttr) [0x00000] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 
  at System.Reflection.RuntimeReflectionExtensions.GetRuntimeProperties (System.Type type) [0x00014] in <9f0df102fe6e4cfea29d2e46f585d8a5>:0 
  at System.Composition.TypedParts.Discovery.TypeInspector+<DiscoverPropertyExports>d__7.MoveNext () [0x00030] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.TypedParts.Discovery.TypeInspector+<DiscoverExports>d__5.MoveNext () [0x000dc] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.TypedParts.Discovery.TypeInspector.InspectTypeForPart (System.Reflection.TypeInfo type, System.Composition.TypedParts.Discovery.DiscoveredPart& part) [0x00061] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.TypedParts.TypedPartExportDescriptorProvider..ctor (System.Collections.Generic.IEnumerable`1[T] types, System.Composition.Convention.AttributedModelProvider attributeContext) [0x00037] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.Hosting.ContainerConfiguration.CreateContainer () [0x00042] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at Microsoft.CodeAnalysis.Host.Mef.MefHostServices.Create (System.Collections.Generic.IEnumerable`1[T] assemblies) [0x00031] in <2b89d626687148ba8fbf92b75d65cebf>:0 
  at OmniSharp.HostServicesAggregator.CreateHostServices () [0x00000] in <3c22014bb8b9403ba6b94645d03f0cd7>:0 
  at OmniSharp.OmniSharpWorkspace..ctor (OmniSharp.HostServicesAggregator aggregator, Microsoft.Extensions.Logging.ILoggerFactory loggerFactory, OmniSharp.FileWatching.IFileSystemWatcher fileSystemWatcher) [0x00046] in <3c22014bb8b9403ba6b94645d03f0cd7>:0 
  at (wrapper dynamic-method) System.Object.lambda_method(System.Runtime.CompilerServices.Closure,System.Composition.Hosting.Core.LifetimeContext,System.Composition.Hosting.Core.CompositionOperation)
  at System.Composition.TypedParts.ActivationFeatures.DisposalFeature+<>c__DisplayClass0_0.<RewriteActivator>b__0 (System.Composition.Hosting.Core.LifetimeContext c, System.Composition.Hosting.Core.CompositionOperation o) [0x00000] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.Hosting.Core.LifetimeContext.GetOrCreate (System.Int32 sharingId, System.Composition.Hosting.Core.CompositionOperation operation, System.Composition.Hosting.Core.CompositeActivator creator) [0x000a8] in <8e026c716fc84f38aae28085eaaee9fc>:0 
  at System.Composition.TypedParts.ActivationFeatures.LifetimeFeature+<>c__DisplayClass1_0.<RewriteActivator>b__0 (System.Composition.Hosting.Core.LifetimeContext c, System.Composition.Hosting.Core.CompositionOperation o) [0x00011] in <9aac21a4a3f24063b2b8b59143acddfc>:0 
  at System.Composition.Hosting.Core.CompositionOperation.Run (System.Composition.Hosting.Core.LifetimeContext outermostLifetimeContext, System.Composition.Hosting.Core.CompositeActivator compositionRootActivator) [0x0001c] in <8e026c716fc84f38aae28085eaaee9fc>:0 
  at System.Composition.Hosting.Core.LifetimeContext.TryGetExport (System.Composition.Hosting.Core.CompositionContract contract, System.Object& export) [0x0001d] in <8e026c716fc84f38aae28085eaaee9fc>:0 
  at System.Composition.Hosting.CompositionHost.TryGetExport (System.Composition.Hosting.Core.CompositionContract contract, System.Object& export) [0x00000] in <8e026c716fc84f38aae28085eaaee9fc>:0 
  at System.Composition.CompositionContext.GetExport (System.Composition.Hosting.Core.CompositionContract contract) [0x00000] in <12675e53c8854b48abd187539ce374db>:0 
  at System.Composition.CompositionContext.GetExport (System.Type exportType, System.String contractName) [0x00008] in <12675e53c8854b48abd187539ce374db>:0 
  at System.Composition.CompositionContext.GetExport[TExport] (System.String contractName) [0x00000] in <12675e53c8854b48abd187539ce374db>:0 
  at System.Composition.CompositionContext.GetExport[TExport] () [0x00000] in <12675e53c8854b48abd187539ce374db>:0 
  at OmniSharp.Stdio.Host.Initialize () [0x0000d] in <65e0aca433ab4fb4946c0b3fc58fd85a>:0 
  at OmniSharp.Stdio.Host..ctor (System.IO.TextReader input, OmniSharp.Services.ISharedTextWriter writer, OmniSharp.IOmniSharpEnvironment environment, System.IServiceProvider serviceProvider, OmniSharp.CompositionHostBuilder compositionHostBuilder, Microsoft.Extensions.Logging.ILoggerFactory loggerFactory, System.Threading.CancellationTokenSource cancellationTokenSource) [0x0007b] in <65e0aca433ab4fb4946c0b3fc58fd85a>:0 
  at OmniSharp.Stdio.Driver.Program+<>c__DisplayClass0_1.<Main>b__1 () [0x0017d] in <eda49c0af257459b858c33bd65a6834a>:0 
  at OmniSharp.CommandLineApplication+<>c__DisplayClass11_0.<OnExecute>b__0 () [0x0000b] in <02ecf52e50b5487fbf035af7482feffd>:0 
  at McMaster.Extensions.CommandLineUtils.CommandLineApplication.Execute (System.String[] args) [0x00039] in <344a1e8cd6594b17b1e01f8df6ae8827>:0 
  at OmniSharp.CommandLineApplication.Execute (System.String[] args) [0x00081] in <02ecf52e50b5487fbf035af7482feffd>:0 
  at OmniSharp.Stdio.Driver.Program+<>c__DisplayClass0_0.<Main>b__0 () [0x00028] in <eda49c0af257459b858c33bd65a6834a>:0 
  at OmniSharp.HostHelpers.Start (System.Func`1[TResult] action) [0x0001c] in <02ecf52e50b5487fbf035af7482feffd>:0

[razzmatazz]

Could not load signature of Roslynator.CSharp.SyntaxWalkers.CSharpSyntaxNodeWalker:VisitFileScopedNamespaceDeclaration due to: Could not resolve type with token 01000129 from typeref (expected class 'Microsoft.CodeAnalysis.CSharp.Syntax.FileScopedNamespaceDeclarationSyntax' in assembly 'Microsoft.CodeAnalysis.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35') assembly:Microsoft.CodeAnalysis.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 type:Microsoft.CodeAnalysis.CSharp.Syntax.FileScopedNamespaceDeclarationSyntax member:(null)
System.TypeLoadException: Parent class vtable failed to initialize, due to: VTable setup of type Roslynator.CSharp.SyntaxWalkers.CSharpSyntaxNodeWalker failed assembly:/home/emilyseville7cfg/.vscode/extensions/josefpihrt-vscode.roslynator-4.1.1/roslyn/common/Roslynator.CSharp.dll type:CSharpSyntaxNodeWalker member:(null)

oh, this looks very much like a mono/runtime issue (?) and should be reported to omnisharp-roslyn (underlying language server) repository:

• https://github.com/OmniSharp/omnisharp-roslyn/issues

[EmilyGraceSeville7cf]

I've created the issue in their repo. ;)

[razzmatazz]

In the meantime, have you tried using emacs/lsp-mode (or joaotavora/eglot) for C# on emacs? Are there any issues?

Because eventually omnisharp-emacs will get deprecated..

[EmilyGraceSeville7cf]

No, I don't see any benefit for my self in eglot. I've used just package.el.

[razzmatazz]

Oh, I am not sure I expressed myself properly, basically on emacs (AFAIK) there are 5 options to get C# integration in the editor:

• (a) omnisharp-emacs + omnisharp-roslyn (legacy omnisharp-roslyn protocol) – which you are using now
• (b) lsp-mode + omnisharp-roslyn (LSP mode)
• (c) lsp-mode + csharp-ls (LSP mode)
• (d) eglot + omnisharp-roslyn (LSP mode)
• (e) eglot + csharp-ls (LSP mode)

option (a) is a bit outdated, as LSP mode is being actively developed, both the clients and servers

[VM-KTO]

I am trying to set this up for the first time in 28.2. is this realistic, I can't get anything but syntax color highlighting to work?