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

Time: 12/01/13 5:09 PM
Description: Exception ticking world

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
	at java.util.HashMap$KeyIterator.next(Unknown Source)
	at yz.a(SourceFile:72)
	at in.b(SourceFile:108)
	at net.minecraft.server.MinecraftServer.r(SourceFile:737)
	at net.minecraft.server.MinecraftServer.q(SourceFile:680)
	at bfd.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:614)
	at fy.run(SourceFile:850)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
	at java.util.HashMap$KeyIterator.next(Unknown Source)
	at yz.a(SourceFile:72)
	at in.b(SourceFile:108)

-- Affected level --
Details:
	Level name: New Large World
	All players: 1 total; [iq['macwil96'/140930, l='New Large World', x=-1131.53, y=96.23, z=-277.53]]
	Chunk stats: ServerChunkCache: 1066 Drop: 0
	Level seed: 847294266
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-132,64,256), Chunk: (at 12,4,0 in -9,16; contains blocks -144,0,256 to -129,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 220961 game time, 220961 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 59336 (now: false), thunder time: 21916 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.r(SourceFile:737)
	at net.minecraft.server.MinecraftServer.q(SourceFile:680)
	at bfd.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:614)
	at fy.run(SourceFile:850)

-- System Details --
Details:
	Minecraft Version: 13w02b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_09, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 5574385880 bytes (5316 MB) / 6189088768 bytes (5902 MB) up to 6189088768 bytes (5902 MB)
	JVM Flags: 2 total; -Xms6144m -Xmx6144m
	AABB Pool Size: 4844 (271264 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1224 (68544 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [iq['macwil96'/140930, l='New Large World', x=-1131.53, y=96.23, z=-277.53]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Very likely; Jar signature invalidated