"The first field is empty"--Image Occulusion

I’m trying to add a flashcard with an image, but every time that I try to add the card to the deck, it keeps saying “The first field is empty”. The first field is “ID (Hidden)” so it’s a hidden field. I tried deleting the field, but that messed up the add-on and I couldn’t include pictures. I have the desktop version and have the most recent update.