2013-01-20 22:41:08 [SEVERE] net.minecraft.server.v1_4_6.ReportedException: Ticking entity
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:584)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
2013-01-20 22:41:08 [SEVERE] Caused by: java.util.ConcurrentModificationException
2013-01-20 22:41:08 [SEVERE] 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
2013-01-20 22:41:08 [SEVERE] 	at java.util.HashMap$KeyIterator.next(HashMap.java:928)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.EntityTracker.a(EntityTracker.java:191)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.EntityPlayer.j_(EntityPlayer.java:186)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.World.entityJoinedWorld(World.java:1334)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.WorldServer.entityJoinedWorld(WorldServer.java:548)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.World.playerJoinedWorld(World.java:1315)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.World.tickEntities(World.java:1193)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.WorldServer.tickEntities(WorldServer.java:445)
2013-01-20 22:41:08 [SEVERE] 	at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:580)
2013-01-20 22:41:08 [SEVERE] 	... 4 more
2013-01-20 22:41:08 [SEVERE] Encountered an unexpected exception ReportedException
net.minecraft.server.v1_4_6.ReportedException: Ticking entity
	at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:584)
	at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
	at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
	at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
	at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
	at java.util.HashMap$KeyIterator.next(HashMap.java:928)
	at net.minecraft.server.v1_4_6.EntityTracker.a(EntityTracker.java:191)
	at net.minecraft.server.v1_4_6.EntityPlayer.j_(EntityPlayer.java:186)
	at net.minecraft.server.v1_4_6.World.entityJoinedWorld(World.java:1334)
	at net.minecraft.server.v1_4_6.WorldServer.entityJoinedWorld(WorldServer.java:548)
	at net.minecraft.server.v1_4_6.World.playerJoinedWorld(World.java:1315)
	at net.minecraft.server.v1_4_6.World.tickEntities(World.java:1193)
	at net.minecraft.server.v1_4_6.WorldServer.tickEntities(WorldServer.java:445)
	at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:580)
	... 4 more
2013-01-20 22:41:08 [SEVERE] This crash report has been saved to: /root/Minecraft/./crash-reports/crash-2013-01-20_22.41.08-server.txt