MCrash

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 19/04/12 14:59
Description: Failed to start game

java.lang.NullPointerException
	at java.io.Reader.<init>(Unknown Source)
	at java.io.InputStreamReader.<init>(Unknown Source)
	at aew.a(SourceFile:55)
	at aew.a(SourceFile:89)
	at net.minecraft.client.Minecraft.a(SourceFile:239)
	at net.minecraft.client.Minecraft.run(SourceFile:620)
	at java.lang.Thread.run(Unknown Source)

Relevant Details:
- Minecraft Version: 12w16a
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.6.0_30, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
- Memory: 417057352 bytes (397 MB) / 518979584 bytes (494 MB) up to 1037959168 bytes (989 MB)
- LWJGL: 2.4.2
- OpenGL: ATI Radeon HD 4600 Series GL version 3.3.11554 Compatibility Profile Context, ATI Technologies Inc.