Hopper: java.lang.NoClassDefFoundError: bcx

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-49186/

Crash:

java.lang.NoClassDefFoundError: bcx
	at bcv.a(SourceFile:37)
	at bcv.<init>(SourceFile:25)
	at avk.b(SourceFile:478)
	at avk.a(SourceFile:274)
	at avk.b(SourceFile:30)
	at avl.a(SourceFile:312)
	at awd.a(SourceFile:173)
	at avk.a(SourceFile:263)

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

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 8/11/13 11:13 PM
Description: Rendering screen

java.lang.NoClassDefFoundError: bcw
	at bcv.a(SourceFile:37)
	at bcv.<init>(SourceFile:25)
	at avk.b(SourceFile:478)
	at avk.a(SourceFile:274)
	at avk.b(SourceFile:30)
	at avl.a(SourceFile:312)
	at awd.a(SourceFile:173)
	at avk.a(SourceFile:263)
	at bfb.b(SourceFile:718)
	at ats.S(SourceFile:686)
	at ats.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)
Caused by: java.lang.ClassNotFoundException: bcw
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 12 more


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

-- Head --
Stacktrace:
	at bcv.a(SourceFile:37)
	at bcv.<init>(SourceFile:25)
	at avk.b(SourceFile:478)
	at avk.a(SourceFile:274)
	at avk.b(SourceFile:30)
	at avl.a(SourceFile:312)
	at awd.a(SourceFile:173)
	at avk.a(SourceFile:263)

-- Screen render details --
Details:
	Screen name: avk
	Mouse location: Scaled: (257, 96). Absolute: (1028, 634)
	Screen size: Scaled: (480, 255). Absolute: (1920, 1018). Scale factor of 4
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 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 40798640 bytes (38 MB) / 69750784 bytes (66 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
	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: AMD Radeon HD 6450 GL version 4.2.11931 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
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-49186/2288236/