Error Occurs When Running on Arclight 1.21.1 with NeoForge

[interacp]

I installed the latest version of the WorldEdit plugin that supports 1.21.1. Following the documentation, I edited the config.yml file inside the worldedit folder located in the plugins directory. Specifically, I added the following lines after command-block-support: false as instructed:allow-editing-on-unsupported-versions: "I accept that I will receive no support with this flag enabled."
However, even after making these changes, simple commands like //set air and //cut are causing the following error:

[23:59:45 ERROR] [c.s.w.e.p.PlatformCommandManager]: An unexpected error while handling a WorldEdit command
java.lang.NoSuchMethodError: 'org.bukkit.craftbukkit.v1_21_R1.block.data.CraftBlockData org.bukkit.craftbukkit.v1_21_R1.block.data.CraftBlockData.createData(net.minecraft.world.level.block.state.BlockState)'
        at com.sk89q.worldedit.bukkit.adapter.impl.v1_21.PaperweightAdapter.adapt(PaperweightAdapter.java:347) ~[?:?]
        at com.sk89q.worldedit.bukkit.adapter.impl.v1_21.PaperweightAdapter.getBlock(PaperweightAdapter.java:379) ~[?:?]
        at com.sk89q.worldedit.bukkit.adapter.impl.v1_21.PaperweightAdapter.getFullBlock(PaperweightAdapter.java:384) ~[?:?]
        at com.sk89q.worldedit.bukkit.BukkitWorld.getFullBlock(BukkitWorld.java:508) ~[?:?]
        at com.sk89q.worldedit.EditSession.getFullBlock(EditSession.java:714) ~[?:?]
        at com.sk89q.worldedit.function.block.ExtentBlockCopy.apply(ExtentBlockCopy.java:72) ~[?:?]
        at com.sk89q.worldedit.function.CombinedRegionFunction.apply(CombinedRegionFunction.java:87) ~[?:?]
        at com.sk89q.worldedit.function.RegionMaskingFilter.apply(RegionMaskingFilter.java:53) ~[?:?]
        at com.sk89q.worldedit.function.visitor.RegionVisitor.resume(RegionVisitor.java:60) ~[?:?]
        at com.sk89q.worldedit.function.operation.DelegateOperation.resume(DelegateOperation.java:52) ~[?:?]
        at com.sk89q.worldedit.function.operation.Operations.completeLegacy(Operations.java:55) ~[?:?]
        at com.sk89q.worldedit.command.ClipboardCommands.cut(ClipboardCommands.java:139) ~[?:?]
        at com.sk89q.worldedit.command.ClipboardCommandsRegistration.cmd$_cut(ClipboardCommandsRegistration.java:252) ~[?:?]
        at org.enginehub.piston.CommandManager.execute(CommandManager.java:157) ~[?:?]
        at com.sk89q.worldedit.extension.platform.PlatformCommandManager.handleCommand(PlatformCommandManager.java:507) ~[?:?]
        at com.sk89q.worldedit.util.eventbus.MethodHandleEventHandler.dispatch(MethodHandleEventHandler.java:51) ~[?:?]
        at com.sk89q.worldedit.util.eventbus.EventHandler.handleEvent(EventHandler.java:73) ~[?:?]
        at com.sk89q.worldedit.util.eventbus.EventBus.dispatch(EventBus.java:193) ~[?:?]
        at com.sk89q.worldedit.util.eventbus.EventBus.post(EventBus.java:181) ~[?:?]
        at com.sk89q.worldedit.bukkit.WorldEditPlugin.onCommand(WorldEditPlugin.java:391) ~[?:?]
        at com.sk89q.bukkit.util.DynamicPluginCommand.execute(DynamicPluginCommand.java:55) ~[?:?]
        at TRANSFORMER/[email protected]+a9d8ec3/org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:150) ~[arclight-1.21.1-1.0.1-SNAPSHOT-a9d8ec3.jar%23191!/:arclight-1.21.1-1.0.1-SNAPSHOT-a9d8ec3]
        at TRANSFORMER/[email protected]+a9d8ec3/org.bukkit.craftbukkit.v1_21_R1.CraftServer.dispatchCommand(CraftServerMixin.java:922) ~[arclight-1.21.1-1.0.1-SNAPSHOT-a9d8ec3.jar%23191!/:arclight-1.21.1-1.0.1-SNAPSHOT-a9d8ec3]
        at TRANSFORMER/[email protected]+a9d8ec3/org.bukkit.craftbukkit.v1_21_R1.command.BukkitCommandWrapper.run(BukkitCommandWrapper.java:50) ~[arclight-1.21.1-1.0.1-SNAPSHOT-a9d8ec3.jar%23191!/:arclight-1.21.1-1.0.1-SNAPSHOT-a9d8ec3]
        at MC-BOOTSTRAP/[email protected]/com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73) ~[brigadier-1.3.10.jar%23131!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:29) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:13) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.commands.execution.UnboundEntryAction.lambda$bind$0(UnboundEntryAction.java:8) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.commands.execution.CommandQueueEntry.execute(CommandQueueEntry.java:8) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.commands.execution.ExecutionContext.runCommandQueue(ExecutionContext.java:107) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.commands.Commands.executeCommandInContext(CommandsMixin_NeoForge.java:363) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.commands.Commands.performCommand(CommandsMixin_NeoForge.java:284) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.server.network.ServerGamePacketListenerImpl.performUnsignedChatCommand(ServerGamePacketListenerImplMixin_HighPriority.java:1282) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$7(ServerGamePacketListenerImplMixin_HighPriority.java:1269) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.server.TickTask.run(TickTask.java:18) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoopMixin.java:148) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:23) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer.doRunTask(MinecraftServerMixin_NeoForge.java:872) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer.doRunTask(MinecraftServerMixin_NeoForge.java:170) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoopMixin.java:122) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServerMixin_NeoForge.java:855) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer.pollTask(MinecraftServerMixin_NeoForge.java:849) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoopMixin.java:132) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer.managedBlock(MinecraftServerMixin_NeoForge.java:821) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServerMixin_NeoForge.java:826) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer.runServer(MinecraftServerMixin_NeoForge.java:712) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServerMixin_NeoForge.java:267) ~[server-1.21.1-20240808.144430-srg.jar%23189!/:?]
        at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]

What should I do to make WorldEdit work properly?
If I manage to fix this issue, will WorldGuard also work without problems?

[Storm-Dev6]

Hi @interacp,

The error you're encountering:
java.lang.NoSuchMethodError: 'org.bukkit.craftbukkit.v1_21_R1.block.data.CraftBlockData org.bukkit.craftbukkit.v1_21_R1.block.data.CraftBlockData.createData(net.minecraft.world.level.block.state.BlockState)'

indicates that WorldEdit is trying to call a method that does not exist in the Arclight 1.21.1 environment. This usually happens because the plugin is built against a vanilla Paper/Spigot API and server implementation, but Arclight uses a custom fork (NeoForge) that may not include all the expected Bukkit/CraftBukkit internals or has them modified.

What you can try:

1 - Use a version of WorldEdit built specifically for Arclight/NeoForge:
Check if there's a WorldEdit build or fork compatible with Arclight 1.21.1 and NeoForge. Sometimes community forks or special builds fix these incompatibilities.

2 - Avoid using unsupported flags if possible:
The allow-editing-on-unsupported-versions flag is risky and may cause unexpected behavior like this. If the plugin isn't officially supporting Arclight yet, that could be why it breaks.

3 - Wait for official support or report the issue to WorldEdit maintainers:
You could open an issue with the WorldEdit project or check their Discord/forums to see if Arclight support is planned or in progress.

4 - Try an alternative server implementation if WorldEdit is critical:
If WorldEdit features are essential and this bug blocks you, running the server on vanilla Paper 1.21.1 or Fabric/Forge with a compatible WorldEdit version might be more stable for now.

Regarding WorldGuard, it relies heavily on WorldEdit internals and Bukkit APIs as well, so until the WorldEdit compatibility issue is resolved, WorldGuard may also not function properly on Arclight 1.21.1 with NeoForge.

Summary: This is a compatibility problem between WorldEdit and Arclight’s modified server internals. Either wait for a dedicated build or consider alternative server implementations if you need stable WorldEdit and WorldGuard support.

Hope this helps! Let me know if you need further assistance.

[InitAuther97]

WorldEdit 7.3.10-beta-01 should work out of the box for Arclight 1.21.1 1.0.1 without the need of allowing editing on unsupported version since we supported it. Which version are you using?

[InitAuther97]

We are basically bridging Spigot with Minecraft so there won't be such problem as a missing method in CraftBukkit; you can perceive it as we ship a full Spigot along. It can only be the problem from WorldEdit; maybe they dropped their support for 1.21.1 which results in this NoSuchMethodError.