Crashes

Please help heres the crash report

---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 7/3/13 10:34 PM
Description: Unexpected error

java.lang.NullPointerException
	at blc.a(SourceFile:211)
	at atn.S(SourceFile:671)
	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:
---------------------------------------------------------------------------------------

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bcx['IHasDoughnut'/400, l='MpServer', x=483.38, y=5.62, z=52.42]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (593,4,79), Chunk: (at 1,0,15 in 37,4; contains blocks 592,0,64 to 607,255,79), Region: (1,0; contains chunks 32,0 to 63,31, blocks 512,0,0 to 1023,255,511)
	Level time: 10235 game time, 10235 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: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 12 total; [bcx['IHasDoughnut'/400, l='MpServer', x=483.38, y=5.62, z=52.42], rn['Chicken'/395, l='MpServer', x=530.19, y=4.00, z=19.03], tp['Slime'/394, l='MpServer', x=492.66, y=4.00, z=38.47], rn['Chicken'/393, l='MpServer', x=527.34, y=4.00, z=22.38], tp['Slime'/392, l='MpServer', x=544.76, y=4.00, z=-13.27], ob['entity.LeashKnot.name'/399, l='MpServer', x=472.50, y=4.50, z=55.50], rn['Chicken'/397, l='MpServer', x=530.63, y=4.00, z=21.72], rn['Chicken'/396, l='MpServer', x=521.53, y=4.00, z=28.47], tp['Slime'/2693, l='MpServer', x=457.38, y=4.00, z=-11.49], rv['Pig'/386, l='MpServer', x=402.50, y=4.00, z=-25.50], tp['Slime'/10860, l='MpServer', x=410.06, y=4.00, z=99.44], rp['Horse'/391, l='MpServer', x=472.78, y=4.00, z=57.97]]
	Retry entities: 0 total; []
Stacktrace:
	at bcu.a(SourceFile:284)
	at atn.b(SourceFile:1743)
	at atn.d(SourceFile:632)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.1
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 176817520 bytes (168 MB) / 397115392 bytes (378 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 206 (11536 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.1
	LWJGL: 2.9.0
	OpenGL: ATI Radeon HD 3200 Graphics GL version 3.3.11653 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 97 (5432 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used