Put the summary of the bug you're having here
What I expected to happen was...:
To open the game and start playing
What actually happened was...:
It brings up the game screen and closes and gives the error
Steps to Reproduce:
1. Login
2. Press play
3. It brings up the game screen and the bug appears
Environment
OS: Windows 7 (ver 6.1, arch amd64)
Java: 1.7.0_40 (by Oracle Corporation)
Launcher: 1.2.5 (bootstrap 5)
Minecraft: 1.6.4 (updated Fri Sep 20 03:52:37 NZST 2013)
Duplicate of MC-15564