Hopper: java.lang.NoClassDefFoundError: paulscode/sound/libraries/LibraryLWJGLOpenAL

java.lang.NoClassDefFoundError: paulscode/sound/libraries/LibraryLWJGLOpenAL
	at bsw.<init>(SourceFile:66)
	at btc.<init>(SourceFile:63)
	at azd.Z(SourceFile:396)

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 10/25/13 10:17 PM
Description: Initializing game

java.lang.NoClassDefFoundError: paulscode/sound/libraries/LibraryLWJGLOpenAL
	at bsw.<init>(SourceFile:66)
	at btc.<init>(SourceFile:63)
	at azd.Z(SourceFile:396)
	at azd.e(SourceFile:689)
	at net.minecraft.client.main.Main.main(SourceFile:103)
Caused by: java.lang.ClassNotFoundException: paulscode.sound.libraries.LibraryLWJGLOpenAL
	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)
	... 5 more


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

-- Head --
Stacktrace:
	at bsw.<init>(SourceFile:66)
	at btc.<init>(SourceFile:63)
	at azd.Z(SourceFile:396)

-- Initialization --
Details:
Stacktrace:
	at azd.e(SourceFile:689)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_40, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 129244440 bytes (123 MB) / 162529280 bytes (155 MB) up to 954728448 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
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.7.2
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 7400M Series GL version 4.2.12002 Compatibility Profile Context 9.12.8.0, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
	Anisotropic Filtering: Off (1)