2013-01-16 02:40:17 [SEVERE] java.util.ConcurrentModificationException
2013-01-16 02:40:17 [SEVERE] 	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
2013-01-16 02:40:17 [SEVERE] 	at java.util.ArrayList$Itr.next(Unknown Source)
2013-01-16 02:40:17 [SEVERE] 	at net.minecraft.server.v1_4_6.EntityTrackerEntry.track(EntityTrackerEntry.java:85)
2013-01-16 02:40:17 [SEVERE] 	at net.minecraft.server.v1_4_6.EntityTracker.updatePlayers(EntityTracker.java:138)
2013-01-16 02:40:17 [SEVERE] 	at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:589)
2013-01-16 02:40:17 [SEVERE] 	at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
2013-01-16 02:40:17 [SEVERE] 	at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
2013-01-16 02:40:17 [SEVERE] 	at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
2013-01-16 02:40:17 [SEVERE] 	at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
2013-01-16 02:40:17 [SEVERE] Encountered an unexpected exception ConcurrentModificationException
java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
	at java.util.ArrayList$Itr.next(Unknown Source)
	at net.minecraft.server.v1_4_6.EntityTrackerEntry.track(EntityTrackerEntry.java:85)
	at net.minecraft.server.v1_4_6.EntityTracker.updatePlayers(EntityTracker.java:138)
	at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:589)
	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)

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---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 1/16/13 2:40 AM
Description: Exception in server tick loop

java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
	at java.util.ArrayList$Itr.next(Unknown Source)
	at net.minecraft.server.v1_4_6.EntityTrackerEntry.track(EntityTrackerEntry.java:85)
	at net.minecraft.server.v1_4_6.EntityTracker.updatePlayers(EntityTracker.java:138)
	at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:589)
	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)