When I go to the wp-admin URL of your website, I also see the “There was a critical error on this site” page. So it’s definitely reproducible: https://dineseo.wuaze.com/wp-admin/
The first step to fixing the critical error is to figure out what the critical error is. The best way to do that is to set WP_DEBUG on your website to true and refresh the page. That should show you the actual PHP error message which tells us a lot more about what’s going on.