Crash with Dimensional Doors (Just the Error)

2013-06-26 04:48:50 [INFO] [STDOUT] Loading World: local/World 3_0 (Semi-Legitimate)
2013-06-26 04:48:50 [INFO] [STDERR] net.minecraft.util.ReportedException: Ticking entity
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:660)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:573)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:171)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:470)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
2013-06-26 04:48:50 [INFO] [STDERR] Caused by: java.util.ConcurrentModificationException
2013-06-26 04:48:50 [INFO] [STDERR] 	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
2013-06-26 04:48:50 [INFO] [STDERR] 	at java.util.HashMap$KeyIterator.next(Unknown Source)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.entity.EntityTracker.func_85172_a(EntityTracker.java:334)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.entity.player.EntityPlayerMP.func_70071_h_(EntityPlayerMP.java:302)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.world.World.func_72866_a(World.java:2342)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:717)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.world.World.func_72870_g(World.java:2304)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.world.World.func_72939_s(World.java:2150)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:546)
2013-06-26 04:48:50 [INFO] [STDERR] 	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:654)
2013-06-26 04:48:50 [INFO] [STDERR] 	... 4 more
2013-06-26 04:48:50 [SEVERE] [Minecraft-Server] Encountered an unexpected exception ReportedException
net.minecraft.util.ReportedException: Ticking entity
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:660)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:573)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:171)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:470)
	at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
	at java.util.HashMap$KeyIterator.next(Unknown Source)
	at net.minecraft.entity.EntityTracker.func_85172_a(EntityTracker.java:334)
	at net.minecraft.entity.player.EntityPlayerMP.func_70071_h_(EntityPlayerMP.java:302)
	at net.minecraft.world.World.func_72866_a(World.java:2342)
	at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:717)
	at net.minecraft.world.World.func_72870_g(World.java:2304)
	at net.minecraft.world.World.func_72939_s(World.java:2150)
	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:546)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:654)
	... 4 more
2013-06-26 04:48:50 [SEVERE] [Minecraft-Server] This crash report has been saved to: C:\Users\Kyle\Desktop\MultiMC\instances\Newest Non-Tech\minecraft\crash-reports\crash-2013-06-26_04.48.50-server.txt
2013-06-26 04:48:50 [INFO] [Minecraft-Server] Stopping server
2013-06-26 04:48:50 [INFO] [Minecraft-Server] Saving players
2013-06-26 04:48:50 [INFO] [STDOUT] Unloading Player: lulks
2013-06-26 04:48:50 [INFO] [Minecraft-Server] Saving worlds
2013-06-26 04:48:50 [INFO] [Minecraft-Server] Saving chunks for level 'World 3.0 (Semi-Legitimate)'/Overworld
2013-06-26 04:48:50 [INFO] [Minecraft-Server] Saving chunks for level 'World 3.0 (Semi-Legitimate)'/Nether
2013-06-26 04:48:50 [INFO] [Minecraft-Server] Saving chunks for level 'World 3.0 (Semi-Legitimate)'/PocketDim 73
2013-06-26 04:48:51 [INFO] [ForgeModLoader] Unloading dimension 0
2013-06-26 04:48:51 [INFO] [ForgeModLoader] Unloading dimension -1
2013-06-26 04:48:51 [INFO] [ForgeModLoader] Unloading dimension 73
2013-06-26 04:48:51 [INFO] [ForgeModLoader] The state engine was in incorrect state SERVER_STOPPING and forced into state SERVER_STOPPED. Errors may have been discarded.
Minecraft successfully killed

Minecraft exited with code -1.
Minecraft was killed.