Eigenartige Fehlermeldung :/

Hey Leute,
seit einiger Zeit kann ich kein /forestgen mehr machen dann erscheint diese fehlermeldung auf dem Server:

Quote:

2012-04-01 20:01:27 [SEVERE] java.lang.AbstractMethodError: com.sk89q.worldedit.bukkit.EditSessionBlockChangeD elegate.setTypeIdAndData(IIIII)Z
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.WorldGenerator.setTypeAndData (WorldGenerator.java:31)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.WorldGenerator.setType(WorldG enerator.java:25)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.WorldGenTrees.generate(WorldG enTrees.java:75)
2012-04-01 20:01:27 [SEVERE] at org.bukkit.craftbukkit.CraftWorld.generateTree(Cra ftWorld.java:410)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.worldedit.bukkit.BukkitWorld.generateTre e(BukkitWorld.java:399)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.worldedit.util.TreeGenerator.generate(Tr eeGenerator.java:139)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.worldedit.util.TreeGenerator.generate(Tr eeGenerator.java:118)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.worldedit.EditSession.makeForest(EditSes sion.java:2632)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.worldedit.commands.GenerationCommands.fo restGen(GenerationCommands.java:254)
2012-04-01 20:01:27 [SEVERE] at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
2012-04-01 20:01:27 [SEVERE] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
2012-04-01 20:01:27 [SEVERE] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
2012-04-01 20:01:27 [SEVERE] at java.lang.reflect.Method.invoke(Unknown Source)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.minecraft.util.commands.CommandsManager. invokeMethod(CommandsManager.java:514)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.worldedit.WorldEdit$1.invokeMethod(World Edit.java:182)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.worldedit.WorldEdit$1.invokeMethod(World Edit.java:113)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.minecraft.util.commands.CommandsManager. executeMethod(CommandsManager.java:501)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.minecraft.util.commands.CommandsManager. execute(CommandsManager.java:419)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.worldedit.WorldEdit.handleCommand(WorldE dit.java:1250)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.worldedit.bukkit.WorldEditPlugin.onComma nd(WorldEditPlugin.java:197)
2012-04-01 20:01:27 [SEVERE] at com.sk89q.bukkit.util.DynamicPluginCommand.execute (DynamicPluginCommand.java:40)
2012-04-01 20:01:27 [SEVERE] at org.bukkit.command.SimpleCommandMap.dispatch(Simpl eCommandMap.java:166)
2012-04-01 20:01:27 [SEVERE] at org.bukkit.craftbukkit.CraftServer.dispatchCommand (CraftServer.java:473)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.NetServerHandler.handleComman d(NetServerHandler.java:821)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.NetServerHandler.chat(NetServ erHandler.java:781)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.NetServerHandler.a(NetServerH andler.java:764)
2012-04-01 20:01:27 [SEVERE] at lishid.orebfuscator.hook.NetServerHandlerProxy.a(N etServerHandlerProxy.java:117)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.Packet3Chat.handle(Packet3Cha t.java:33)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.NetworkManager.b(NetworkManag er.java:229)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.NetServerHandler.a(NetServerH andler.java:113)
2012-04-01 20:01:27 [SEVERE] at lishid.orebfuscator.hook.NetServerHandlerProxy.a(N etServerHandlerProxy.java:60)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.NetworkListenThread.a(Network ListenThread.java:78)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.MinecraftServer.w(MinecraftSe rver.java:554)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.MinecraftServer.run(Minecraft Server.java:452)
2012-04-01 20:01:27 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(S ourceFile:490)

Danke im Vorraus :handsdown: