Initializing game

Put the summary of the bug you're having here

What I expected to happen was...:
I clicked on the launcher and open as normal, I typed in my login details and and then clicked on the play button waiting for it to open.

What actually happened was...:
After clicking open I waited a while and then it closes and the crash report comes up.

Steps to Reproduce:
1. I open minecraft, and login with my account
2. Once open I click on play waiting for it to open.
3. After waiting a while it will close and the crash report will come up.