keeps saying crash report and not letting 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
for it to let me play.
What actually happened was...:
Describe what happened here
it kept on saying crash report
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...open minecraft
3. ...press play