---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 7/8/13 1:03 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 atn.a(SourceFile:1426)
at avy.e(SourceFile:157)
at avz.a(SourceFile:210)
at avx.a(SourceFile:173)
at avy.a(SourceFile:183)
at bet.b(SourceFile:718)
at atn.S(SourceFile:685)
at atn.d(SourceFile:618)
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 atn.a(SourceFile:1426)
at avy.e(SourceFile:157)
at avz.a(SourceFile:210)
at avx.a(SourceFile:173)
at avy.a(SourceFile:183)

– Screen render details –
Details:
Screen name: bli
Mouse location: Scaled: (301, 73). Absolute: (603, 558)
Screen size: Scaled: (683, 353). Absolute: (1366, 706). Scale factor of 2
Stacktrace:
at bet.b(SourceFile:718)
at atn.S(SourceFile:685)
at atn.d(SourceFile:618)
at net.minecraft.client.main.Main.main(SourceFile:101)

– System Details –
Details:
Minecraft Version: 1.6.1
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: 252192232 bytes (240 MB) / 386531328 bytes (368 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: 1, tallocated: 63
Launched Version: 1.6.1
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics 3000 GL version 3.1.0 - Build 9.17.10.2932, Intel
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Pack: Soartex_Fanver.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~_ERROR~ NullPointerException: null
----------------------------------------------------------------------------------------------
Ways you could trigger this bug :
1. Too many structures in game.
2. Too many worlds.
......etc...