Minecraft Cashing In 1.8 while starting up

Put the summary of the bug you're having here

*What I expected to happen was...: Minecraft to start normally
Describe what you thought should happen here

*What actually happened was...: minecraft crashed multipule times
Describe what happened here

Steps to Reproduce:
1. start up minecraft
2.press start
3.three wait about 30-40 seconds and then it crashes