Minecraft launcher says it's an exit code 1 error. Log is included. Game was only crashing after I installed Rubidium.
latest.log

not a rubidium issue at all
Do you install FABRIC Chunk Pregenerator?
https://github.com/jaskarth/fabric-chunkpregenerator/blob/master/src/main/resources/chunkpregen.mixins.json

Oh, I got it, seems you are using stupid CurseForge launcher lol

Even after removing chunk pregenerator the game still crashes.

latest log

here it is

Still not a rubidium issue
install this to fix

The game still crashes. Also, I wasn't sure if it was Rubidium specifically, but the crashes only happen when it's installed.

I'm sure it definitely has nothing to do with Rubidium.
This time your config/fml.toml went wrong and crashed the game just as Night Config Fixes CurseForge desc tells.
You'd better check it out and delete to reset it.

Seems like it's fixed now. Thanks for the help even though it wasn't Rubidium (sorry)