Can't get past the startup menu.

Put the summary of the bug you're having here

What I expected to happen was...: I thought I would be able to play the new minecraft version 1.15

What actually happened was...: But the game loaded as if I would be able to play it then told me there was an error and that the game crashed. 

Steps to Reproduce:
1. Launch the Minecraft app. 
2. Press "Play" on Minecraft.
3. ...