My launcher keeps crashing mid-load.

[Tammy J Rizzo]

I was playing just fine a few minutes ago, but I had to log out and close out the game (I play a Forge-modded 1.15.2 game). Now, though, when I try to load the game back up to keep playing, I always get this crash warning before the loader is finished loading the game:

 

The game crashed whilst initializing game
Error: java.lang.NullPointerException: Initializing game
Exit Code: -1

 

I have no idea what this means. I've tried reading my log file, but, again, I have no idea what it means. The only change I made before closing out the game was to turn on Sildur's Enhanced Vanilla shader. I was getting different error messages for the first few times, but they mentioned specific mods, which I shifted over to a different directory for now. But now, this is all I get, time after time after time. Can anyone help me?