---- Minecraft Crash Report ----
// Sorry :(

Time: 3/11/13 10:19 PM
Description: Adding entity to track

java.lang.IllegalStateException: Entity is already tracked!
	at it.a(SourceFile:76)
	at it.a(SourceFile:61)
	at iv.a(SourceFile:24)
	at zv.a(SourceFile:867)
	at iz.a(SourceFile:635)
	at zv.d(SourceFile:859)
	at amn.k(SourceFile:55)
	at amn.a(SourceFile:35)
	at iz.a(SourceFile:430)
	at iz.b(SourceFile:142)
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bja.q(SourceFile:122)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)


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

-- Entity To Track --
Details:
	Tracking range: 144 blocks
	Update interval: Once per 20 ticks
	Entity Type: FallingSand (ra)
	Entity ID: 7887
	Entity Name: Falling Block
	Entity's Exact location: 299.50, 42.50, -53.50
	Entity's Block location: World: (299,42,-54), Chunk: (at 11,2,10 in 18,-4; contains blocks 288,0,-64 to 303,255,-49), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Entity's Momentum: 0.00, 0.00, 0.00
	Immitating block ID: 13
	Immitating block data: 0
Stacktrace:
	at it.a(SourceFile:76)
	at it.a(SourceFile:61)
	at iv.a(SourceFile:24)
	at zv.a(SourceFile:867)
	at iz.a(SourceFile:635)
	at zv.d(SourceFile:859)
	at amn.k(SourceFile:55)
	at amn.a(SourceFile:35)

-- Block being ticked --
Details:
	Block type: ID #13 (tile.gravel // amk)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (299,42,-54), Chunk: (at 11,2,10 in 18,-4; contains blocks 288,0,-64 to 303,255,-49), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Stacktrace:
	at iz.a(SourceFile:430)
	at iz.b(SourceFile:142)

-- Affected level --
Details:
	Level name: TenPaces LB
	All players: 1 total; [jc['TenPaces'/250, l='TenPaces LB', x=249.50, y=63.00, z=-166.50]]
	Chunk stats: ServerChunkCache: 625 Drop: 0
	Level seed: -1258152253
	Level generator: ID 02 - largeBiomes, ver 0. Features enabled: true
	Level generator options: 
	Level spawn location: World: (244,64,-168), Chunk: (at 4,4,8 in 15,-11; contains blocks 240,0,-176 to 255,255,-161), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 304 game time, 304 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 82349 (now: false), thunder time: 153836 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bja.q(SourceFile:122)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)

-- System Details --
Details:
	Minecraft Version: 1.5
	Operating System: Linux (i386) version 3.2.0-38-generic
	Java Version: 1.7.0_15, Oracle Corporation
	Java VM Version: OpenJDK Server VM (mixed mode), Oracle Corporation
	Memory: 283021704 bytes (269 MB) / 451280896 bytes (430 MB) up to 477233152 bytes (455 MB)
	JVM Flags: 2 total; -Xms256m -Xmx512m
	AABB Pool Size: 8580 (480480 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 71
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1284 (71904 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [jc['TenPaces'/250, l='TenPaces LB', x=249.50, y=63.00, z=-166.50]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.