Crash in 13w16b when launching minecraft

---- Minecraft Crash Report ----
// You're mean.

Time: 4/24/13 8:03 AM
Description: Failed to start game

java.lang.NullPointerException
	at java.io.Reader.<init>(Unknown Source)
	at java.io.InputStreamReader.<init>(Unknown Source)
	at br.a(SourceFile:65)
	at br.a(SourceFile:101)
	at ask.K(SourceFile:308)
	at ask.c(SourceFile:508)
	at net.minecraft.client.main.Main.main(SourceFile:78)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
	Minecraft Version: 13w16b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_13, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 100856496 bytes (96 MB) / 157089792 bytes (149 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 1 total; -Xmx1G
	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
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 7640G GL version 4.2.11476 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Texture Pack: Wollicraft.zip
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null