Hopper: java.lang.ClassCastException: bit cannot be cast to fm

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-476003/

Crash:

java.lang.ClassCastException: bit cannot be cast to fm
	at gi.a(SourceFile:10)
	at ef.a(SourceFile:164)
	at bbe.c(SourceFile:76)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 2013-10-27 18:19
Description: Ticking screen

java.lang.ClassCastException: bit cannot be cast to fm
	at gi.a(SourceFile:10)
	at ef.a(SourceFile:164)
	at bbe.c(SourceFile:76)
	at azd.o(SourceFile:1318)
	at azd.ad(SourceFile:753)
	at azd.e(SourceFile:704)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at gi.a(SourceFile:10)
	at ef.a(SourceFile:164)
	at bbe.c(SourceFile:76)

-- Affected screen --
Details:
	Screen name: bbe
Stacktrace:
	at azd.o(SourceFile:1318)
	at azd.ad(SourceFile:753)
	at azd.e(SourceFile:704)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 21799664 bytes (20 MB) / 82198528 bytes (78 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	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: 1.7.2
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 7420G GL version 4.2.11764 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: Svenska (Sverige)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
	Anisotropic Filtering: Off (1)

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-476003/22432279/