Maybe you are using notes from a shared deck? Or changed Anki version recently?
See if this helps: Image Occlusion Enhanced error field names - #3 by deli
You could also try the following:
- Rename the note type ‘Image Occlusion Enhanced’ to something else
e.g. ‘Image Occlusion Enhanced_1’
(you can do this from the Browser or from the Add card window) - The “Image Occlusion Enhanced” button should now work again
- Click on it and add a new card → this will automatically create a new ‘Image Occlusion Enhanced’ note type
- Open the Browser, select all your old Image Occlusion Enhanced cards, and change them to this new note type