The last week or so I have been receiving notices that there is an uncaught error on my site as follows (generated by the Wordpress Your Site Is Experiencing Technical Errors email):-
Error message: Uncaught Error: Call to undefined function x_get_view() in /home/customer/www/mysiteurl.com/public_html/wp-content/themes/x/404.php:15
My X Theme is up to date, as is Wordpress, I have not added any new plugins recently. Could you please advise what the issue could be and any steps I might be able to take to fix the problem? The site shows up fine on the frontend, dashboard backend is fine also.