Problem mit CHUNK_LOAD

2012-07-23 10:24:00 [WARNING] Could not properly handle event CHUNK_LOAD:
java.lang.IllegalAccessError: Synchronized code got accessed from another thread: java.util.TimerThread
	at org.bukkit.event.Listener.onChunkLoad(Listener:0)
	at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:460)
	at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:103)
	at com.bergerkiller.bukkit.nolagg.examine.TimedChunkProviderServer.getChunkAt(TimedChunkProviderServer.java:147)
	at org.bukkit.craftbukkit.CraftWorld.getChunkAt(CraftWorld.java:105)
	at org.bukkit.craftbukkit.CraftWorld.getBlockAt(CraftWorld.java:69)
	at org.bukkit.craftbukkit.CraftWorld.getBlockAt(CraftWorld.java:480)
	at org.bukkit.Location.getBlock(Location.java:82)
	at de.MRTeam.MinecartRevolution.Listener.MinecartListener.isMinecartOnRail(MinecartListener.java:262)
	at de.MRTeam.MinecartRevolution.Util.RemoveDerailedCartsUtil.removeMinecart(RemoveDerailedCartsUtil.java:28)
	at de.MRTeam.MinecartRevolution.Util.RemoveDerailedCartsUtil.access$0(RemoveDerailedCartsUtil.java:26)
	at de.MRTeam.MinecartRevolution.Util.RemoveDerailedCartsUtil$1.run(RemoveDerailedCartsUtil.java:42)
	at java.util.TimerThread.mainLoop(Timer.java:555)
	at java.util.TimerThread.run(Timer.java:505)
2012-07-23 10:24:00 [INFO] This error is logged only once: it could have occurred multiple times by now.
2012-07-23 10:24:00 [SEVERE] java.lang.NullPointerException
2012-07-23 10:24:00 [SEVERE] 	at net.minecraft.server.World.tickEntities(World.java:1176)
2012-07-23 10:24:00 [SEVERE] 	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:558)
2012-07-23 10:24:00 [SEVERE] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
2012-07-23 10:24:00 [SEVERE] 	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
2012-07-23 10:24:00 [SEVERE] Unexpected exception
java.lang.NullPointerException
	at net.minecraft.server.World.tickEntities(World.java:1176)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:558)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)