WORLDEDIT-2625 - Reported by ProKoolio

2013-01-22 01:06:36 [INFO] ProKoolio issued server command: //undo
2013-01-22 01:06:36 [SEVERE] java.lang.NoClassDefFoundError: net/minecraft/server/Block
2013-01-22 01:06:36 [SEVERE] at com.sk89q.worldedit.bukkit.BukkitWorld.isValidBlockType(BukkitWorld.java:872)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.worldedit.EditSession.rawSetBlock(EditSession.java:184)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.worldedit.EditSession.flushQueue(EditSession.java:677)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.worldedit.EditSession.undo(EditSession.java:416)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.worldedit.LocalSession.undo(LocalSession.java:149)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.worldedit.commands.HistoryCommands.undo(HistoryCommands.java:59)
2013-01-22 01:06:36 [SEVERE] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-01-22 01:06:36 [SEVERE] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
2013-01-22 01:06:36 [SEVERE] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
2013-01-22 01:06:36 [SEVERE] at java.lang.reflect.Method.invoke(Method.java:601)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.minecraft.util.commands.CommandsManager.invokeMethod(CommandsManager.java:522)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.worldedit.WorldEdit$1.invokeMethod(WorldEdit.java:241)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.worldedit.WorldEdit$1.invokeMethod(WorldEdit.java:172)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.minecraft.util.commands.CommandsManager.executeMethod(CommandsManager.java:509)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.minecraft.util.commands.CommandsManager.execute(CommandsManager.java:425)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.worldedit.WorldEdit.handleCommand(WorldEdit.java:1339)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.worldedit.bukkit.WorldEditPlugin.onCommand(WorldEditPlugin.java:197)
2013-01-22 01:06:36 [SEVERE] at com.sk89q.bukkit.util.DynamicPluginCommand.execute(DynamicPluginCommand.java:52)
2013-01-22 01:06:36 [SEVERE] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
2013-01-22 01:06:36 [SEVERE] at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchCommand(CraftServer.java:547)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.PlayerConnection.handleCommand(PlayerConnection.java:990)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.PlayerConnection.chat(PlayerConnection.java:908)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:852)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.Packet3Chat.handle(Packet3Chat.java:44)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:585)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:481)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:416)
2013-01-22 01:06:36 [SEVERE] at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
2013-01-22 01:06:36 [SEVERE] Caused by: java.lang.ClassNotFoundException: net.minecraft.server.Block
2013-01-22 01:06:36 [SEVERE] at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70)
2013-01-22 01:06:36 [SEVERE] at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
2013-01-22 01:06:36 [SEVERE] at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
2013-01-22 01:06:36 [SEVERE] at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
2013-01-22 01:06:36 [SEVERE] ... 33 more