Legacy4J Version

1.20.1

Mod Loader Version

Fabric 0.15.6

Bug/Glitch Occurrence Context

I added the mod, And it crashes and gives me out an error. Is it my problem or the mods?

Crash Report

https://pastebin.com/hQDdVuPT

What happened wrong?

I Opened the game and it crashes.

This is certainly because of a custom launcher

i don't think so, it looks like an incompatibility between wurst (the steal buttons, i think) and legacy4j (which highly modifies all guis). what happens if you try to open the game with wurst disabled?