Comment on Technical Support by SEO Dave.
It’s not a Stallion theme error/issue, it’s a known problem with the KK Star Ratings Plugin https://wordpress.org/support/topic/plugin-kk-star-ratings-an-error-occured?replies=21 including in the latest version.
When I found the original cause of your error I posted above I also found other websites with the same error message “Thanks! An error occurred!” and none of them ran Stallion. Go search Google for
“Thanks! An error occurred!”
The above sounds like deactivating and reactivating the KK Star Ratings Plugin fixed the error. Nothing to do with a theme.