Hopper: java.lang.NoClassDefFoundError: org/lwjgl/opengl/WindowsKeycodes

java.lang.NoClassDefFoundError: org/lwjgl/opengl/WindowsKeycodes
	at org.lwjgl.opengl.WindowsKeyboard.handleKey(WindowsKeyboard.java:163)
	at org.lwjgl.opengl.WindowsDisplay.handleKeyButton(WindowsDisplay.java:866)
	at org.lwjgl.opengl.WindowsDisplay.doHandleMessage(WindowsDisplay.java:1038)
	at org.lwjgl.opengl.WindowsDisplay.handleMessage(WindowsDisplay.java:882)
	at org.lwjgl.opengl.WindowsDisplay.nUpdate(Native Method)
	at org.lwjgl.opengl.WindowsDisplay.update(WindowsDisplay.java:524)
	at org.lwjgl.opengl.Display.processMessages(Display.java:600)
	at org.lwjgl.opengl.Display.update(Display.java:666)
	at org.lwjgl.opengl.Display.update(Display.java:628)
	at atv.S(SourceFile:679)
	at atv.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)
Caused by: java.lang.ClassNotFoundException: org.lwjgl.opengl.WindowsKeycodes
	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

---- Minecraft Crash Report ----
// Would you like a cupcake?

Time: 9/21/13 7:59 PM
Description: Unexpected error

java.lang.NoClassDefFoundError: org/lwjgl/opengl/WindowsKeycodes
	at org.lwjgl.opengl.WindowsKeyboard.handleKey(WindowsKeyboard.java:163)
	at org.lwjgl.opengl.WindowsDisplay.handleKeyButton(WindowsDisplay.java:866)
	at org.lwjgl.opengl.WindowsDisplay.doHandleMessage(WindowsDisplay.java:1038)
	at org.lwjgl.opengl.WindowsDisplay.handleMessage(WindowsDisplay.java:882)
	at org.lwjgl.opengl.WindowsDisplay.nUpdate(Native Method)
	at org.lwjgl.opengl.WindowsDisplay.update(WindowsDisplay.java:524)
	at org.lwjgl.opengl.Display.processMessages(Display.java:600)
	at org.lwjgl.opengl.Display.update(Display.java:666)
	at org.lwjgl.opengl.Display.update(Display.java:628)
	at atv.S(SourceFile:679)
	at atv.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)
Caused by: java.lang.ClassNotFoundException: org.lwjgl.opengl.WindowsKeycodes
	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:
---------------------------------------------------------------------------------------

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_09, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 36470672 bytes (34 MB) / 69550080 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: ~~ERROR~~ NoClassDefFoundError: org/lwjgl/MemoryUtil$1
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.4
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 6800 Series GL version 4.2.12217 Compatibility Profile Context 12.104.0.0, 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 (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null