---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 23/11/12 17:42
Description: Exception ticking world

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
	at java.util.HashMap$KeyIterator.next(Unknown Source)
	at yi.a(SourceFile:72)
	at in.b(SourceFile:113)
	at net.minecraft.server.MinecraftServer.r(SourceFile:743)
	at net.minecraft.server.MinecraftServer.q(SourceFile:686)
	at bdo.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:620)
	at fy.run(SourceFile:856)


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 yi.a(SourceFile:72)
	at in.b(SourceFile:113)

-- Affected level --
Details:
	Level name: 404 Survival
	All players: 1 total; [iq['Ingo6453'/2188772, l='404 Survival', x=132.50, y=78.03, z=253.50]]
	Chunk stats: ServerChunkCache: 1089 Drop: 0
	Level seed: 4665494104071747351
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (128,64,248), Chunk: (at 0,4,8 in 8,15; contains blocks 128,0,240 to 143,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 4 game time, 4 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 120671 (now: false), thunder time: 14575 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.r(SourceFile:743)
	at net.minecraft.server.MinecraftServer.q(SourceFile:686)
	at bdo.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:620)
	at fy.run(SourceFile:856)

-- System Details --
Details:
	Minecraft Version: 1.4.5
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.6.0_20, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
	Memory: 188313680 bytes (179 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1024m
	AABB Pool Size: 5039 (282184 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: IWrUpdater, Config, WrUpdates, ...]
	IntCache: cache: 2, tcache: 0, allocated: 1, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 822 (46032 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [iq['Ingo6453'/2188772, l='404 Survival', x=132.50, y=78.03, z=253.50]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Very likely; Jar signature invalidated