2013-02-16 17:09:47 [SEVERE] net.minecraft.server.v1_4_R1.ReportedException: Exception ticking world entities
2013-02-16 17:09:47 [SEVERE] 	at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:575)
2013-02-16 17:09:47 [SEVERE] 	at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
2013-02-16 17:09:47 [SEVERE] 	at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:485)
2013-02-16 17:09:47 [SEVERE] 	at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:420)
2013-02-16 17:09:47 [SEVERE] 	at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
2013-02-16 17:09:47 [SEVERE] Caused by: java.util.ConcurrentModificationException
2013-02-16 17:09:47 [SEVERE] 	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:819)
2013-02-16 17:09:47 [SEVERE] 	at java.util.ArrayList$Itr.next(ArrayList.java:791)
2013-02-16 17:09:47 [SEVERE] 	at net.minecraft.server.v1_4_R1.World.tickEntities(World.java:1304)
2013-02-16 17:09:47 [SEVERE] 	at net.minecraft.server.v1_4_R1.WorldServer.tickEntities(WorldServer.java:479)
2013-02-16 17:09:47 [SEVERE] 	at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:571)
2013-02-16 17:09:47 [SEVERE] 	... 4 more
2013-02-16 17:09:47 [SEVERE] Encountered an unexpected exception ReportedException
net.minecraft.server.v1_4_R1.ReportedException: Exception ticking world entities
	at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:575)
	at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
	at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:485)
	at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:420)
	at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
Caused by: java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:819)
	at java.util.ArrayList$Itr.next(ArrayList.java:791)
	at net.minecraft.server.v1_4_R1.World.tickEntities(World.java:1304)
	at net.minecraft.server.v1_4_R1.WorldServer.tickEntities(WorldServer.java:479)
	at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:571)
	... 4 more
2013-02-16 17:14:49 [SEVERE] ------------------------------
2013-02-16 17:14:49 [SEVERE] Current Thread: Thread-20167
2013-02-16 17:14:49 [SEVERE]     PID: 40361 | Alive: true | State: TIMED_WAITING
2013-02-16 17:14:49 [SEVERE]     Stack:
2013-02-16 17:14:49 [SEVERE]         java.lang.Thread.sleep(Native Method)
2013-02-16 17:14:49 [SEVERE]         me.kmacho.bukkit.loot.LootChest.run(LootChest.java:48)
2013-02-16 17:14:49 [SEVERE]         java.lang.Thread.run(Thread.java:722)
2013-02-16 17:14:49 [SEVERE] ------------------------------
2013-02-16 17:14:49 [SEVERE] Current Thread: Thread-22836
2013-02-16 17:14:49 [SEVERE]     PID: 45682 | Alive: true | State: TIMED_WAITING
2013-02-16 17:14:49 [SEVERE]     Stack:
2013-02-16 17:14:49 [SEVERE]         java.lang.Thread.sleep(Native Method)
2013-02-16 17:14:49 [SEVERE]         me.kmacho.bukkit.loot.LootChest.run(LootChest.java:50)
2013-02-16 17:14:49 [SEVERE]         java.lang.Thread.run(Thread.java:722)
2013-02-16 17:14:49 [SEVERE] ------------------------------
2013-02-16 17:14:49 [SEVERE] Current Thread: Thread-21461
2013-02-16 17:14:49 [SEVERE]     PID: 42935 | Alive: true | State: TIMED_WAITING
2013-02-16 17:14:49 [SEVERE]     Stack:
2013-02-16 17:14:49 [SEVERE]         java.lang.Thread.sleep(Native Method)
2013-02-16 17:14:49 [SEVERE]         me.kmacho.bukkit.loot.LootChest.run(LootChest.java:50)
2013-02-16 17:14:49 [SEVERE]         java.lang.Thread.run(Thread.java:722)