fawe not working with arclight due to mods modifying blocks

[matiasmodica2013-cell]

when i use fawe with arclight it does not work, for example every single command like //set or //wand do not work, when you load minecraft arclight 1.20.1 forge for the first time and do any command it returns this and also says to report it to the owners [00:41:02 ERROR] [STDERR]: Initializing Legacy Material Support. Unless you have legacy plugins and/or data this is a bug!
[00:41:04 ERROR] [c.s.w.e.p.PlatformCommandManager]: An unexpected error while handling a FastAsyncWorldEdit command
java.lang.NoClassDefFoundError: Could not initialize class com.sk89q.worldedit.world.block.BlockTypes
at com.sk89q.worldedit.world.item.ItemType.getBlockType(ItemType.java:129) ~[?:?]
at com.sk89q.worldedit.world.item.ItemType.hasBlockType(ItemType.java:117) ~[?:?]
at com.sk89q.worldedit.LocalSession.setTool(LocalSession.java:1331) ~[?:?]
at com.sk89q.worldedit.command.SelectionCommands.wand(SelectionCommands.java:343) ~[?:?]
at com.sk89q.worldedit.command.SelectionCommandsRegistration.cmd$wand(SelectionCommandsRegistration.java:404) ~[?:?]
at org.enginehub.piston.CommandManager.execute(CommandManager.java:157) ~[?:?]
at com.sk89q.worldedit.extension.platform.PlatformCommandManager.lambda$handleCommandOnCurrentThread$16(PlatformCommandManager.java:725) ~[?:?]
at com.sk89q.worldedit.extension.platform.PlatformCommandManager.handleCommandTask(PlatformCommandManager.java:746) ~[?:?]
at com.sk89q.worldedit.extension.platform.PlatformCommandManager.handleCommandOnCurrentThread(PlatformCommandManager.java:727) ~[?:?]
at com.sk89q.worldedit.extension.platform.PlatformCommandManager.lambda$handleCommand$13(PlatformCommandManager.java:690) ~[?:?]
at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftTask.run(CraftTask.java:82) ~[arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad.jar%23227!/:arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad]
at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:54) ~[arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad.jar%23227!/:arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
at java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.ExceptionInInitializerError [in thread "Server thread"]
at com.sk89q.worldedit.world.block.BlockTypes.init(BlockTypes.java:2186) ~[?:?]
at com.sk89q.worldedit.world.block.BlockTypes.(BlockTypes.java:48) ~[?:?]
at com.sk89q.worldedit.world.block.BlockState.get(BlockState.java:152) ~[?:?]
at com.sk89q.worldedit.world.block.BlockState.get(BlockState.java:128) ~[?:?]
at com.sk89q.worldedit.world.registry.LegacyMapper.loadFromResource(LegacyMapper.java:124) ~[?:?]
at com.sk89q.worldedit.world.registry.LegacyMapper.(LegacyMapper.java:84) ~[?:?]
at com.sk89q.worldedit.world.registry.LegacyMapper.getInstance(LegacyMapper.java:329) ~[?:?]
at com.sk89q.worldedit.WorldEdit.loadMappings(WorldEdit.java:432) ~[?:?]
at com.sk89q.worldedit.bukkit.WorldEditPlugin.setupPreWorldData(WorldEditPlugin.java:241) ~[?:?]
at com.sk89q.worldedit.bukkit.WorldEditPlugin.onEnable(WorldEditPlugin.java:211) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPluginMixin.java:266) ~[arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad.jar%23227!/:arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoaderMixin.java:342) ~[arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad.jar%23227!/:arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManagerAccessor.java:480) ~[arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad.jar%23227!/:arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad]
at org.bukkit.craftbukkit.v1_20_R1.CraftServer.enablePlugin(CraftServerMixin.java:546) ~[arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad.jar%23227!/:arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad]
at org.bukkit.craftbukkit.v1_20_R1.CraftServer.enablePlugins(CraftServerMixin.java:460) ~[arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad.jar%23227!/:arclight-1.20.1-1.0.6-SNAPSHOT-166b7ad]
at net.minecraft.server.dedicated.DedicatedServer.handler$bof000$arclight$loadPlugins(DedicatedServerMixin.java:642) ~[server-1.20.1-20230612.114412-srg.jar%23293!/:?]
at net.minecraft.server.dedicated.DedicatedServer.m_7038(DedicatedServerMixin.java:158) ~[server-1.20.1-20230612.114412-srg.jar%23293!/:?]
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServerMixin.java:2029) ~[server-1.20.1-20230612.114412-srg.jar%23293!/:?]
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServerMixin.java:251) ~[server-1.20.1-20230612.114412-srg.jar%23293!/:?]
... 1 more

[SirYwell]

Hybrid servers are not and won't ever be supported.

[sietrixtechnologies]

Thanks for the clarification. Given that hybrid servers aren’t supported, this behavior makes sense.

For anyone facing this, it may help to:

• Run FAWE on a supported server setup (pure Paper/Spigot)
• Avoid mixing modded environments like Arclight with FAWE
• Check plugin compatibility before combining mod + plugin ecosystems