I was going to play on the Nexus and a crash report poped up and i did not know what to do?

Put the summary of the bug you're having here

*What I expected to happen was to start playing on the Nexus but a bug/crash report happenend

What actually happened was when it was building the terrian it just stopped and took me to a crash report page

*Steps to Reproduce:
1. i clicked on Nexus
2. It was building terrian
3. A crash report popped up