I can get into my main world

Put the summary of the bug you're having here I cant get into my main world.

What I expected to happen was...: I would enter the world.
Describe what you thought should happen here
I would enter the world.
What actually happened was...: the game crashed.

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
try to open the world.
2. then the game crashes.
3. ...