It appears the issue is the Formidable plugin version, which must be higher than (or equal to) 2.0.9. Yours is at 2.0.8. We’ve added a message on our plugin page informing users they must update the Formidable Forms plugin and where to update the Formidable Forms plugin in one click, usually located at “wp-admin/update-core.php”.
Update Formidable Forms and it should work fine, let us know if you still experience issues.
We remain at your service.