Recorded by MinecraftError (https://github.com/medsouz/MinecraftError).

Automatic analysis: Hm, I can't seem to figure it out.
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LWJGL Version: 2.4.2
WARNING: Found unknown Windows version: Windows 7
Attempting to use default windows plug-in.
Loading: net.java.games.input.DirectAndRawInputEnvironmentPlugin

Starting up SoundSystem...
Initializing LWJGL OpenAL
    (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
OpenAL initialized.

java.lang.NullPointerException
	at cpw.mods.fml.client.FMLClientHandler.getEffectTexture(FMLClientHandler.java:979)
	at cpw.mods.fml.client.FMLClientHandler.getTextureDimensions(FMLClientHandler.java:961)
	at cpw.mods.fml.client.FMLClientHandler.onPreRegisterEffect(FMLClientHandler.java:1077)
	at aaw.a(RenderEngine.java:515)
	at net.minecraft.client.Minecraft.a(SourceFile:320)
	at net.minecraft.client.Minecraft.run(SourceFile:657)
	at java.lang.Thread.run(Unknown Source)