Found duplicate mods:
Mods ID: 'rubidium' from mod files: rubidium-0.5.0.jar, embeddium-0.3.31+mc1.20.1.jar
latest.log

From the log. You installed rubidium and embeddium at the same time

I didn't expect the mod to try to load mods from folders inside the mods folder. I stored mods for other versions there.

you can disable the mod by adding the mod id to disabled_mods.json
And adding a rule to cycle between the conflicting mod sets

On Forge, any dir starting with a dot . will be ignored. Like .connector