Trying to log into demo it looks like it is trying to load but then it crashes

What I expected to happen was I would log into the demo game

What actually happened was the screen flashed a few times and I got an error report

Steps to Reproduce:
1. I logged into my account.
2. I choose to play the demo
3. I chose play demo world
4. I got a brown screen
5. Then I saw hearts and it flashed back to the main screen and then it crashed