i made my world with this
2;1x7,4x159:6,1x0,1x0,1x0,1x0,1x155,1x3,1x3,1x3,1x1,1x7,1x12,1x24,1x92,1x92,1x24,1x12,1x44,1x92,1x12,1x7,1x7,1x24,1x44,1x92,1x171:13,1x155,1x0,1x2,1x3,1x35,1x157,1x171:15,1x92,1x24,1x44,1x12,1x24;1;village
then it crash!
CRASH REPORT:
---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 8/16/14 4:40 PM
Description: Rendering screen

java.lang.NullPointerException: Rendering screen
at add.c(SourceFile:99)
at bny.a(SourceFile:285)
at bda.a(SourceFile:146)
at bda.a(SourceFile:203)
at bcm.b(SourceFile:382)
at bcm.a(SourceFile:259)
at bcz.a(SourceFile:122)
at blt.b(SourceFile:852)
at bao.ak(SourceFile:801)
at bao.f(SourceFile:728)
at net.minecraft.client.main.Main.main(SourceFile:148)

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

– Head –
Stacktrace:
at add.c(SourceFile:99)
at bny.a(SourceFile:285)
at bda.a(SourceFile:146)
at bda.a(SourceFile:203)
at bcm.b(SourceFile:382)
at bcm.a(SourceFile:259)
at bcz.a(SourceFile:122)

– Screen render details –
Details:
Screen name: bcz
Mouse location: Scaled: (269, 293). Absolute: (807, 58)
Screen size: Scaled: (592, 313). Absolute: (1776, 938). Scale factor of 3
Stacktrace:
at blt.b(SourceFile:852)
at bao.ak(SourceFile:801)
at bao.f(SourceFile:728)
at net.minecraft.client.main.Main.main(SourceFile:148)

– System Details –
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_24, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 262522592 bytes (250 MB) / 626233344 bytes (597 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.10
LWJGL: 2.9.1
OpenGL: AMD Radeon HD 7800 Series GL version 4.4.12874 Compatibility Profile Context 14.100.0.0, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)
thanks for hearing