I tried this and it seems the standard WP AJAX is working though the error still comes up. If this can’t be resolved I would appreciate a refund for the pro version which is what i have. No sense in having a plugin that’s not compatible with my set-up 🙁
One thing you might try is to see if standard WP AJAX is working. For example, go to the post categories screen and do a “quick edit” on an existing category. When you click the “update category” button the quick editor uses AJAX to submit the changes, so it’s a good way to check if standard WP is working.