---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 3/2/13 10:01 AM
Description: Exception while ticking a block

java.lang.IllegalStateException: Entity is already tracked!
	at ii.a(SourceFile:69)
	at ii.a(SourceFile:56)
	at ij.a(SourceFile:24)
	at yc.a(SourceFile:842)
	at in.a(SourceFile:580)
	at yc.d(SourceFile:834)
	at akn.l(SourceFile:55)
	at akn.b(SourceFile:35)
	at in.a(SourceFile:388)
	at in.b(SourceFile:136)
	at net.minecraft.server.MinecraftServer.r(SourceFile:736)
	at net.minecraft.server.MinecraftServer.q(SourceFile:679)
	at bdz.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:613)
	at fy.run(SourceFile:849)


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

-- Head --
Stacktrace:
	at ii.a(SourceFile:69)
	at ii.a(SourceFile:56)
	at ij.a(SourceFile:24)
	at yc.a(SourceFile:842)
	at in.a(SourceFile:580)
	at yc.d(SourceFile:834)
	at akn.l(SourceFile:55)
	at akn.b(SourceFile:35)

-- Block being ticked --
Details:
	Block type: ID #13 (tile.gravel // akk)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (1092,19,29), Chunk: (at 4,1,13 in 68,1; contains blocks 1088,0,16 to 1103,255,31), Region: (2,0; contains chunks 64,0 to 95,31, blocks 1024,0,0 to 1535,255,511)
Stacktrace:
	at in.a(SourceFile:388)
	at in.b(SourceFile:136)

-- Affected level --
Details:
	Level name: survival
	All players: 1 total; [iq['ConnorBanden'/2731, l='survival', x=1053.08, y=65.00, z=-121.92]]
	Chunk stats: ServerChunkCache: 845 Drop: 0
	Level seed: 3537651666422927002
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (1054,64,-123), Chunk: (at 14,4,5 in 65,-8; contains blocks 1040,0,-128 to 1055,255,-113), Region: (2,-1; contains chunks 64,-32 to 95,-1, blocks 1024,0,-512 to 1535,255,-1)
	Level time: 346 game time, 346 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 147129 (now: false), thunder time: 151670 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.r(SourceFile:736)
	at net.minecraft.server.MinecraftServer.q(SourceFile:679)
	at bdz.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:613)
	at fy.run(SourceFile:849)

-- System Details --
Details:
	Minecraft Version: 1.4.7
	Operating System: Mac OS X (x86_64) version 10.7.5
	Java Version: 1.6.0_41, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 339151472 bytes (323 MB) / 554369024 bytes (528 MB) up to 1069416448 bytes (1019 MB)
	JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
	AABB Pool Size: 13187 (738472 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: 11888 (665728 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [iq['ConnorBanden'/2731, l='survival', x=1053.08, y=65.00, z=-121.92]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Very likely; Jar signature invalidated