Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at ayy.b(SourceFile:421)
	at ayy.a(SourceFile:405)
	at ayp.a(SourceFile:297)
	at ayw.a(SourceFile:270)

---- Minecraft Crash Report ----
// You're mean.

Time: 2013-09-13 17:26
Description: Rendering screen

java.lang.NullPointerException
	at ayy.b(SourceFile:421)
	at ayy.a(SourceFile:405)
	at ayp.a(SourceFile:297)
	at ayw.a(SourceFile:270)
	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 ayy.b(SourceFile:421)
	at ayy.a(SourceFile:405)
	at ayp.a(SourceFile:297)
	at ayw.a(SourceFile:270)

-- Screen render details --
Details:
	Screen name: ayw
	Mouse location: Scaled: (331, 169). Absolute: (662, 140)
	Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2
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 8 (amd64) version 6.2
	Java Version: 1.7.0_11, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 68636408 bytes (65 MB) / 190054400 bytes (181 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -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: 0, tallocated: 0
	Launched Version: 1.6.2
	LWJGL: 2.9.0
	OpenGL: ATI Radeon HD 5700 Series GL version 4.2.12002 Compatibility Profile Context 9.12.0.0, ATI Technologies Inc.
	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