We checked your server and it seems this is not a Shoppica issue at all. You can change to the default theme and the errors will remain. The admin panel also shows an error every time.
Although this is not a support question, we’ll give you a hint. The server is not configured properly and it does not set the $_SERVER['HTTPS'] variable, which is used from opencart (and almost every PHP application) to determine the https connection. Contact your server administrators to resolve your issue.