Exception in world tick

---- Minecraft Crash Report ----
// Ouch. That hurt :(

Time: 5/23/13 7:51 PM
Description: Exception in world tick

java.lang.OutOfMemoryError: unable to create new native thread
	at java.lang.Thread.start0(Native Method)
	at java.lang.Thread.start(Unknown Source)
	at bfu.<init>(SourceFile:16)
	at bge.a(SourceFile:275)
	at bfy.a(SourceFile:1497)
	at aab.a(SourceFile:867)
	at bds.a(SourceFile:135)
	at aab.d(SourceFile:859)
	at bds.d(SourceFile:117)
	at bds.a(SourceFile:161)
	at bdk.a(SourceFile:303)
	at cs.a(SourceFile:68)
	at ci.b(SourceFile:350)
	at bdk.d(SourceFile:95)
	at bds.b(SourceFile:58)
	at net.minecraft.client.Minecraft.l(SourceFile:1325)
	at net.minecraft.client.Minecraft.K(SourceFile:574)
	at net.minecraft.client.Minecraft.run(SourceFile:526)
	at java.lang.Thread.run(Unknown Source)


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

-- Head --
Stacktrace:
	at java.lang.Thread.start0(Native Method)
	at java.lang.Thread.start(Unknown Source)
	at bfu.<init>(SourceFile:16)
	at bge.a(SourceFile:275)
	at bfy.a(SourceFile:1497)
	at aab.a(SourceFile:867)
	at bds.a(SourceFile:135)
	at aab.d(SourceFile:859)
	at bds.d(SourceFile:117)
	at bds.a(SourceFile:161)
	at bdk.a(SourceFile:303)
	at cs.a(SourceFile:68)
	at ci.b(SourceFile:350)
	at bdk.d(SourceFile:95)

-- Affected level --
Details:
	Level name: MpServer
	All players: 12 total; [bdv['cwideman'/41665434, l='MpServer', x=416.50, y=9.62, z=635.50], bfk['iamabuttmunch44'/35009599, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['brennanboy56'/41632874, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['codyskater'/42128904, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['jbfletchr'/42132006, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['PRMinecrafter1'/41697094, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Nat85309'/41943024, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['zizybalooba'/36633782, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Isvar'/42090353, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['longhead77'/41539442, l='MpServer', x=419.28, y=4.00, z=636.06], bfk['Aesto_'/40665319, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Jordan2569'/42028023, l='MpServer', x=416.50, y=4.00, z=635.50]]
	Chunk stats: MultiplayerChunkCache: 5
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (0,4,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 0 game time, 0 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 25 total; [bfk['iamabuttmunch44'/35009599, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['brennanboy56'/41632874, l='MpServer', x=416.50, y=4.00, z=635.50], bdv['cwideman'/41665434, l='MpServer', x=416.50, y=9.62, z=635.50], bfk['iamabuttmunch44'/35009599, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['brennanboy56'/41632874, l='MpServer', x=416.50, y=4.00, z=635.50], ss['arrow'/22195955, l='MpServer', x=416.31, y=6.09, z=635.13], ss['arrow'/30844998, l='MpServer', x=416.31, y=6.13, z=634.97], bfk['codyskater'/42128904, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['jbfletchr'/42132006, l='MpServer', x=416.50, y=8.00, z=635.50], ss['arrow'/26059276, l='MpServer', x=416.31, y=6.09, z=635.13], bfk['PRMinecrafter1'/41697094, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Nat85309'/41943024, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['zizybalooba'/36633782, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Isvar'/42090353, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['longhead77'/41539442, l='MpServer', x=419.28, y=4.00, z=636.06], bfk['Aesto_'/40665319, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Jordan2569'/42028023, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Aesto_'/40665319, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['longhead77'/41539442, l='MpServer', x=419.28, y=4.00, z=636.06], bfk['Isvar'/42090353, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['zizybalooba'/36633782, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Nat85309'/41943024, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['PRMinecrafter1'/41697094, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['jbfletchr'/42132006, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['codyskater'/42128904, l='MpServer', x=416.50, y=8.00, z=635.50]]
	Retry entities: 0 total; []
Stacktrace:
	at bds.a(SourceFile:282)
	at net.minecraft.client.Minecraft.l(SourceFile:1332)
	at net.minecraft.client.Minecraft.K(SourceFile:574)
	at net.minecraft.client.Minecraft.run(SourceFile:526)
	at java.lang.Thread.run(Unknown Source)

-- Affected level --
Details:
	Level name: MpServer
	All players: 12 total; [bdv['cwideman'/41665434, l='MpServer', x=416.50, y=9.62, z=635.50], bfk['iamabuttmunch44'/35009599, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['brennanboy56'/41632874, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['codyskater'/42128904, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['jbfletchr'/42132006, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['PRMinecrafter1'/41697094, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Nat85309'/41943024, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['zizybalooba'/36633782, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Isvar'/42090353, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['longhead77'/41539442, l='MpServer', x=419.28, y=4.00, z=636.06], bfk['Aesto_'/40665319, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Jordan2569'/42028023, l='MpServer', x=416.50, y=4.00, z=635.50]]
	Chunk stats: MultiplayerChunkCache: 5
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (0,4,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 0 game time, 0 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 25 total; [bfk['iamabuttmunch44'/35009599, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['brennanboy56'/41632874, l='MpServer', x=416.50, y=4.00, z=635.50], bdv['cwideman'/41665434, l='MpServer', x=416.50, y=9.62, z=635.50], bfk['iamabuttmunch44'/35009599, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['brennanboy56'/41632874, l='MpServer', x=416.50, y=4.00, z=635.50], ss['arrow'/22195955, l='MpServer', x=416.31, y=6.09, z=635.13], ss['arrow'/30844998, l='MpServer', x=416.31, y=6.13, z=634.97], bfk['codyskater'/42128904, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['jbfletchr'/42132006, l='MpServer', x=416.50, y=8.00, z=635.50], ss['arrow'/26059276, l='MpServer', x=416.31, y=6.09, z=635.13], bfk['PRMinecrafter1'/41697094, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Nat85309'/41943024, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['zizybalooba'/36633782, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Isvar'/42090353, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['longhead77'/41539442, l='MpServer', x=419.28, y=4.00, z=636.06], bfk['Aesto_'/40665319, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Jordan2569'/42028023, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Aesto_'/40665319, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['longhead77'/41539442, l='MpServer', x=419.28, y=4.00, z=636.06], bfk['Isvar'/42090353, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['zizybalooba'/36633782, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['Nat85309'/41943024, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['PRMinecrafter1'/41697094, l='MpServer', x=416.50, y=4.00, z=635.50], bfk['jbfletchr'/42132006, l='MpServer', x=416.50, y=8.00, z=635.50], bfk['codyskater'/42128904, l='MpServer', x=416.50, y=8.00, z=635.50]]
	Retry entities: 0 total; []

-- System Details --
Details:
	Minecraft Version: 1.5.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 448455944 bytes (427 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1024m
	AABB Pool Size: 9321 (521976 bytes; 0 MB) allocated, 9321 (521976 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	LWJGL: 2.4.2
	OpenGL: GeForce GTX 660/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Texture Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used