Was using default resourcepack, then switched to a converted pack. Right as I clicked on my converted pack, I crashed.
Crash report:
---- Minecraft Crash Report ----
// Why did you do that?
Time: 6/14/13 8:33 PM
Description: Unexpected error
java.lang.NullPointerException
at bhp.j(SourceFile:127)
at bho.c(SourceFile:155)
at bho.d(SourceFile:192)
at bhq.d(SourceFile:76)
at atl.k(SourceFile:1129)
at atl.S(SourceFile:650)
at atl.d(SourceFile:606)
at net.minecraft.client.main.Main.main(SourceFile:85)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- System Details --
Details:
Minecraft Version: 13w24b
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: 111783432 bytes (106 MB) / 351404032 bytes (335 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
Launched Version: 13w24b
LWJGL: 2.9.0
OpenGL: GeForce GTX 660 Ti/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
Related issues
Comments

Duplicate of MC-17831, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.
Your Java version is out of date. Please update your Java to the latest version (1.7.0_21): http://www.java.com/en/download/. Keep in mind that when using a 32-bit browser on a 64-bit OS the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp.
Please report if the issue persists with the latest Java version.
Also, please attach the output of TextureEnder.jar.