about 2 years ago - AndrewT - Direct link
Please try the following:

- unsubscribe from all mods in BOTH the Steam Workshop and the Paradox mod site mods.paradoxplaza.com
- delete the folder Documents/Paradox Interactive/CK3/mod/
- delete the file Documents/Paradox Interactive/CK3/mods_registry.json (if present)
- delete the file Documents/Paradox Interactive/CK3/launcher-v2.sqlite (if present)
- run the game up and check the launcher is okay with no mod or other errors
- subscribe to a few mods

- run the game up and see if those mods are now available to you.

I hope that does it for you!  
about 2 years ago - AndrewT - Direct link
What if you only delete the file Documents/Paradox Interactive/CK3/launcher-v2.sqlite , is that enough to get it working again?

If so we have some launcher or antivirus issue I believe.  
almost 2 years ago - AndrewT - Direct link
VitriustheBrave said: Sorry for necro, but is there a way to manually add the descriptor file?
I don't know, you'd need to ask the modders on that score!