it crashes and it dosent let me play

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
it should go to the main screen for minecraft but it just crashes
What actually happened was...:
Describe what happened
same as I put as the first one here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...