crash!! why

---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 6/19/13 10:08 AM
Description: Updating screen events

java.lang.OutOfMemoryError: unable to create new native thread
	at java.lang.Thread.start0(Native Method)
	at java.lang.Thread.start(Unknown Source)
	at cm.d(SourceFile:373)
	at bcc.b(SourceFile:489)
	at bcj.F(SourceFile:196)
	at avn.a(SourceFile:46)
	at avt.a(SourceFile:71)
	at avt.d(SourceFile:125)
	at avt.m(SourceFile:109)
	at atl.k(SourceFile:1152)
	at atl.S(SourceFile:657)
	at atl.d(SourceFile:613)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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 cm.d(SourceFile:373)
	at bcc.b(SourceFile:489)
	at bcj.F(SourceFile:196)
	at avn.a(SourceFile:46)
	at avt.a(SourceFile:71)
	at avt.d(SourceFile:125)
	at avt.m(SourceFile:109)

-- Affected screen --
Details:
	Screen name: avn

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bcm['FosRoCraft'/73292, l='MpServer', x=237.30, y=66.18, z=-101.08]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (144,64,256), Chunk: (at 0,4,0 in 9,16; contains blocks 144,0,256 to 159,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 68107657 game time, 206411 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: 41 total; [bcm['FosRoCraft'/73292, l='MpServer', x=232.30, y=77.62, z=-280.29], tm['Skeleton'/103904, l='MpServer', x=284.53, y=64.00, z=-23.50], tb['Enderman'/103907, l='MpServer', x=205.31, y=26.11, z=-30.53], rl['Chicken'/73307, l='MpServer', x=199.69, y=3.00, z=-149.28], rl['Chicken'/99398, l='MpServer', x=237.44, y=54.00, z=-39.44], rj['Bat'/103793, l='MpServer', x=252.38, y=25.04, z=-124.59], bec['Grathon'/29542, l='MpServer', x=192.75, y=74.00, z=45.34], rj['Bat'/103792, l='MpServer', x=248.91, y=26.76, z=-120.88], tr['Zombie'/103657, l='MpServer', x=209.50, y=64.00, z=-120.50], rj['Bat'/103794, l='MpServer', x=246.88, y=24.08, z=-123.97], tr['Zombie'/103313, l='MpServer', x=212.50, y=25.00, z=-56.50], rn['Horse'/73310, l='MpServer', x=283.75, y=67.00, z=-124.72], rj['Bat'/102372, l='MpServer', x=266.88, y=19.54, z=-142.47], rl['Chicken'/99400, l='MpServer', x=241.15, y=65.75, z=-33.85], rj['Bat'/103343, l='MpServer', x=232.59, y=43.54, z=-74.31], sn['item.item.egg'/103875, l='MpServer', x=199.78, y=3.13, z=-149.81], rj['Bat'/103632, l='MpServer', x=300.72, y=44.76, z=-161.28], rj['Bat'/102806, l='MpServer', x=232.63, y=43.10, z=-81.25], rj['Bat'/103345, l='MpServer', x=232.25, y=43.10, z=-81.25], ta['Creeper'/103894, l='MpServer', x=297.50, y=64.00, z=-131.50], ny['entity.ItemFrame.name'/73330, l='MpServer', x=380.50, y=86.50, z=-143.06], tr['Zombie'/103120, l='MpServer', x=205.50, y=25.00, z=-39.50], tm['Skeleton'/102762, l='MpServer', x=292.50, y=53.00, z=-146.50], ta['Creeper'/103371, l='MpServer', x=187.50, y=31.00, z=-28.50], ny['entity.ItemFrame.name'/99352, l='MpServer', x=113.06, y=79.50, z=-33.50], og['Painting'/81702, l='MpServer', x=403.00, y=77.50, z=-263.06], ny['entity.ItemFrame.name'/99355, l='MpServer', x=113.06, y=80.50, z=-34.50], ny['entity.ItemFrame.name'/99356, l='MpServer', x=113.06, y=80.50, z=-33.50], og['Painting'/81702, l='MpServer', x=403.00, y=77.50, z=-263.06], tm['Skeleton'/103372, l='MpServer', x=191.50, y=31.00, z=-25.50], tm['Skeleton'/103869, l='MpServer', x=250.50, y=40.00, z=-34.50], bcm['FosRoCraft'/73292, l='MpServer', x=237.30, y=66.18, z=-101.08], ta['Creeper'/103823, l='MpServer', x=211.50, y=72.00, z=-170.50], tm['Skeleton'/103029, l='MpServer', x=239.34, y=37.11, z=-29.30], rx['Squid'/103835, l='MpServer', x=252.50, y=52.00, z=-141.75], bec['Grathon'/29542, l='MpServer', x=199.41, y=68.00, z=45.38], rx['Squid'/103838, l='MpServer', x=245.66, y=52.00, z=-142.94], rj['Bat'/103703, l='MpServer', x=225.00, y=42.00, z=-40.09], rn['Horse'/99367, l='MpServer', x=161.66, y=74.00, z=-36.13], rx['Squid'/103836, l='MpServer', x=250.34, y=52.00, z=-139.50], rx['Squid'/103837, l='MpServer', x=247.94, y=51.00, z=-145.50]]
	Retry entities: 0 total; []
Stacktrace:
	at bcj.a(SourceFile:284)
	at atl.b(SourceFile:1764)
	at atl.d(SourceFile:622)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 13w25b
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 41826792 bytes (39 MB) / 161861632 bytes (154 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 3848 (215488 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Launched Version: 13w25b
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2202, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Texture Pack: efwfef
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 2461 (137816 bytes; 0 MB) allocated, 12 (672 bytes; 0 MB) used