Automatic Basic to Cloze Not Working!

The “automatic basic to close” add-on has not been working for me for some time and I have no idea how to fix it! It’s as if I don’t have the add-on at all. I tried deleting and redownloading the add-on, which didn’t help. I have Anki version 2.1.35 (84dcaa86). Any help would be appreciated, thanks!