Fatal error: Uncaught Error: Call to undefined function add_action() in D:\Domains\wmrtss.org.uk\wwwroot\wp-content\plugins\events-manager\admin\em-bookings.php:17 Stack trace: #0 {main} thrown in D:\Domains\wmrtss.org.uk\wwwroot\wp-content\plugins\events-manager\admin\em-bookings.php on line 17