crashing when leaving sever

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Updating screen events

A full error report has been saved to C:\Users\User\AppData\Roaming\.minecraft\crash-reports\crash-2013-03-29_21.43.17-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash 😞

— BEGIN ERROR REPORT 49ecf82a --------
Full report at:
C:\Users\User\AppData\Roaming\.minecraft\crash-reports\crash-2013-03-29_21.43.17-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 29/03/13 9:43 PM

– Head –
Stacktrace:
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Unknown Source)
at ci.d(SourceFile:371)
at bdl.b(SourceFile:488)
at bdt.D(SourceFile:194)
at axl.a(SourceFile:46)
at axr.a(SourceFile:72)
at axr.d(SourceFile:127)
at axr.m(SourceFile:111)

– Affected screen –
Details:
Screen name: axl

– Affected level –
Details:
Level name: MpServer
All players: 2 total; [bdw['willkillers'/588727, l='MpServer', x=-20.52, y=101.62, z=353.13], bfl['IceFuzz'/590227, l='MpServer', x=-20.72, y=100.00, z=346.88]]
Chunk stats: MultiplayerChunkCache: 121
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (251,68,759), Chunk: (at 11,4,7 in 15,47; contains blocks 240,0,752 to 255,255,767), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
Level time: 345389894 game time, 348562144 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: 27 total; [bfl['grenayd'/303763, l='MpServer', x=241.31, y=85.00, z=274.84], bfl['IceFuzz'/590227, l='MpServer', x=281.61, y=59.00, z=398.70], bfl['Joeyjumple'/4835, l='MpServer', x=287.56, y=69.00, z=342.16], bfl['BRUTALSKILLZ'/567245, l='MpServer', x=303.31, y=60.50, z=406.31], bfl['LSanders97'/304347, l='MpServer', x=301.34, y=59.00, z=404.78], bfl['Conan888'/368487, l='MpServer', x=287.56, y=69.00, z=340.91], bfl['riflekiller'/208106, l='MpServer', x=280.60, y=69.26, z=347.02], bfl['Joeyjumple'/4835, l='MpServer', x=306.67, y=61.10, z=406.11], bfl['Atlassilver1'/468337, l='MpServer', x=327.44, y=62.00, z=435.91], bfl['Atlassilver1'/468337, l='MpServer', x=287.56, y=69.00, z=340.88], bfl['IceFuzz'/590227, l='MpServer', x=-20.72, y=100.00, z=346.88], bfl['IceFuzz'/590227, l='MpServer', x=-57.91, y=74.00, z=542.09], bfl['mrmimosizer'/629830, l='MpServer', x=287.19, y=67.50, z=358.00], bfl['UltraDeathLord11'/309666, l='MpServer', x=283.40, y=59.41, z=396.79], bfl['Princess599599'/71466, l='MpServer', x=306.97, y=59.00, z=397.59], bfl['IceFuzz'/590227, l='MpServer', x=-187.50, y=69.00, z=455.03], bfl['thundermonkey131'/640123, l='MpServer', x=292.64, y=69.00, z=341.20], bdw['willkillers'/588727, l='MpServer', x=-20.52, y=101.62, z=353.13], bfl['IceFuzz'/590227, l='MpServer', x=-101.50, y=82.00, z=537.59], bfl['wolftalk1981'/353743, l='MpServer', x=-61.31, y=75.22, z=498.39], bfl['Conan888'/368487, l='MpServer', x=327.24, y=61.99, z=436.25], bfl['blzar'/476779, l='MpServer', x=327.44, y=62.00, z=435.91], bfl['IceFuzz'/590227, l='MpServer', x=-20.72, y=100.00, z=346.88], bfl['wolftalk1981'/353743, l='MpServer', x=-20.09, y=91.00, z=353.53], bfl['UltraDeathLord11'/309666, l='MpServer', x=301.38, y=59.00, z=421.36], bfl['matt2405'/238595, l='MpServer', x=295.71, y=69.00, z=345.43], bfl['ianmalcolm99'/27573, l='MpServer', x=327.07, y=62.00, z=435.51]]
Retry entities: 0 total; []
Stacktrace:
at bdt.a(SourceFile:282)
at net.minecraft.client.Minecraft.b(SourceFile:1881)
at net.minecraft.client.Minecraft.run(SourceFile:535)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 1.5.1
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 348205040 bytes (332 MB) / 622948352 bytes (594 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 6241 (349496 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
LWJGL: 2.4.2
OpenGL: GeForce GT 640/PCIe/SSE2 GL version 4.2.0, 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: 2268 (127008 bytes; 0 MB) allocated, 14 (784 bytes; 0 MB) used

java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Unknown Source)
at ci.d(SourceFile:371)
at bdl.b(SourceFile:488)
at bdt.D(SourceFile:194)
at axl.a(SourceFile:46)
at axr.a(SourceFile:72)
at axr.d(SourceFile:127)
at axr.m(SourceFile:111)
at net.minecraft.client.Minecraft.l(SourceFile:1078)
at net.minecraft.client.Minecraft.K(SourceFile:574)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Unknown Source)
— END ERROR REPORT 376d3589 ----------