Put the summary of the bug you're having here
What I expected to happen was...:
The world opening normally
What actually happened was...:
The screen flashed for a second and then the game closed itself down.
Steps to Reproduce:
1. Download the new launcher
2. Try and click on a world
Based on a crash report provided in this issue, I believe with high certainty that this report may be a duplicate of MC-24135. You can view all information known about this specific crash at MCX-880.