проблема с world edit

при попытке зарегенирировать пишет вот это http://www.picshare.ru/view/2700312/
а также с командами //set, и часто возникает ошибка при автосохранении и когда обработать регион командой иногда крашает клиент лог краша в прикрепленных файлах и лог сервера в это время

Код:

013-08-03 16:40:09 [SEVERE] [Metrics] Server returned HTTP response code: 502 for URL: http://mcstats.org/report/Spigot
2013-08-03 16:41:33 [INFO] [Metrics] Server returned HTTP response code: 502 for URL: http://mcstats.org/report/LokiBlocker
2013-08-03 16:41:36 [INFO] vlad issued server command: //set 0
2013-08-03 16:41:36 [SEVERE] java.lang.AssertionError: 101
2013-08-03 16:41:36 [SEVERE]    at org.bukkit.craftbukkit.v1_4_R1.block.CraftSkull.getBlockFace(CraftSkull.java:137)
2013-08-03 16:41:36 [SEVERE]    at org.bukkit.craftbukkit.v1_4_R1.block.CraftSkull.getRotation(CraftSkull.java:163)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.bukkit.BukkitWorld.copyFromWorld(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.LocalWorld.getBlock(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.bukkit.BukkitWorld.getBlock(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.EditSession.rawGetBlock(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.EditSession.getBlock(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.EditSession.setBlock(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.EditSession.setBlocks(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.commands.RegionCommands.set(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at sun.reflect.GeneratedMethodAccessor100.invoke(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
2013-08-03 16:41:36 [SEVERE]    at java.lang.reflect.Method.invoke(Method.java:597)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.minecraft.util.commands.CommandsManager.invokeMethod(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.WorldEdit$1.invokeMethod(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.WorldEdit$1.invokeMethod(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.minecraft.util.commands.CommandsManager.executeMethod(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.minecraft.util.commands.CommandsManager.execute(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.WorldEdit.handleCommand(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.worldedit.bukkit.WorldEditPlugin.onCommand(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at com.sk89q.bukkit.util.DynamicPluginCommand.execute(Unknown Source)
2013-08-03 16:41:36 [SEVERE]    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
2013-08-03 16:41:36 [SEVERE]    at org.bukkit.craftbukkit.v1_4_R1.CraftServer.dispatchCommand(CraftServer.java:534)
2013-08-03 16:41:36 [SEVERE]    at iv.d(NetServerHandler.java:1390)
2013-08-03 16:41:36 [SEVERE]    at iv.chat(NetServerHandler.java:1258)
2013-08-03 16:41:36 [SEVERE]    at iv.a(NetServerHandler.java:1182)
2013-08-03 16:41:36 [SEVERE]    at cu.a(Packet3Chat.java:59)
2013-08-03 16:41:36 [SEVERE]    at cg.b(TcpConnection.java:467)
2013-08-03 16:41:36 [SEVERE]    at iv.d(NetServerHandler.java:220)
2013-08-03 16:41:36 [SEVERE]    at iw.b(NetworkListenThread.java:57)
2013-08-03 16:41:36 [SEVERE]    at ht.b(DedicatedServerListenThread.java:34)
2013-08-03 16:41:36 [SEVERE]    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:981)
2013-08-03 16:41:36 [SEVERE]    at ho.r(DedicatedServer.java:309)
2013-08-03 16:41:36 [SEVERE]    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:857)
2013-08-03 16:41:36 [SEVERE]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:744)
2013-08-03 16:41:36 [SEVERE]    at fy.run(ThreadMinecraftServer.java:16)
2013-08-03 16:41:47 [INFO] Connection reset
2013-08-03 16:41:47 [INFO] vlad lost connection: disconnect.quitting
2013-08-03 16:41:47 [INFO] Unloading Player: vlad