Says somethin' about a main error

I would need a proper crash report to diagnose the problem, but the most likely cause is thay you forgot to install cloth config, or installed the forge version of cloth config instead of the fabric version.

Can I have a link to fabric one?

https://www.curseforge.com/minecraft/mc-mods/cloth-config/files
This page has both forge and fabric versions, so don't blindly grab the topmost download.