I had the same issue using Linux(PopOS).
Workaround that worked for me was to just manually create the cards_db directory and then a hidden file named name .cards_db.json inside of that cards_db directory.
/home/user/cards_db/.cards_db.json
I had the same issue using Linux(PopOS).
Workaround that worked for me was to just manually create the cards_db directory and then a hidden file named name .cards_db.json inside of that cards_db directory.
/home/user/cards_db/.cards_db.json