will NOT PLAY AT ALL!!! kepps crashing

Put the summary of the bug you're having here
I push on my world and the screen goes to make crash report
What I expected to happen was...:
Describe what you thought should happen here
my world should boot up
What actually happened was...:
Describe what happened here
won't let me play anything
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...it only says play offline so I push it
3. then I push my world I want to play and it crashes...