crash durring play

Minecraft Crash Report ----
// Shall we play a game?

Time: 7/8/13 9:19 PM
Description: Rendering screen

java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Unknown Source)
at net.minecraft.server.MinecraftServer.v(SourceFile:579)
at ats.a(SourceFile:1432)
at awe.e(SourceFile:157)
at awf.a(SourceFile:210)
at awd.a(SourceFile:173)
at awe.a(SourceFile:183)
at bfb.b(SourceFile:718)
at ats.S(SourceFile:686)
at ats.d(SourceFile:619)
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 net.minecraft.server.MinecraftServer.v(SourceFile:579)
at ats.a(SourceFile:1432)
at awe.e(SourceFile:157)
at awf.a(SourceFile:210)
at awd.a(SourceFile:173)
at awe.a(SourceFile:183)

– Screen render details –
Details:
Screen name: blq
Mouse location: Scaled: (199, 131). Absolute: (598, 505)
Screen size: Scaled: (534, 300). Absolute: (1600, 900). Scale factor of 3
Stacktrace:
at bfb.b(SourceFile:718)
at ats.S(SourceFile:686)
at ats.d(SourceFile:619)
at net.minecraft.client.main.Main.main(SourceFile:101)

– System Details –
Details:
Minecraft Version: 1.6.2
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: 280280640 bytes (267 MB) / 458326016 bytes (437 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 0 (0 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
Launched Version: 1.6.2
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 9.17.10.2867, Intel
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~_ERROR~ NullPointerException: null