It no longer loads.

Put the summary of the bug you're having here

What I expected to happen was...:
The game to load

What actually happened was...:
I pressed play. It gave me the Mojang screen, then flickered. Finally out with the loader presenting the error

Steps to Reproduce:
1. I press Play
2. It shows the Mojang screen
3. It flickers, then crashes. Reloads the loader, and presents the error