My game crash

Put the summary of the bug you're having here

What I expected to happen was...:
When i will start my private games to Play, my game Crash.
What actually happened was...:
When i click Play the game Crash and i get a Crash Report .
Steps to Reproduce:
1. I start the launcher
2. First Problem i can Play only offline
3. But thats ok, i click the Play button
4. Now the game run
5. I click at the singelplayer
6. Then i choose 1 world and click at choosen world Play
7. The world load and then i get a Crash Report
8. Even when I create a world i get a Crash Report.
9. I install a new launcher but there are still the same Problems

When you Need the chrash Report to help me i will send it in an other mail.
Perhaps you can help me only with my description.

yours

marvin