when i start up my game and join a server it says uhh oh it seems thers been a crash

Put the summary of the bug you're having here

*What I expected to happen was...:*to actually play
Describe what you thought should happen here
i should join the server
What actually happened was...:
Describe what happened here it justs crashes

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...open up minecraft
3. ...then join a server