Fatal error: Uncaught Error: Call to undefined function add_filter() in D:\Domains\wmrtss.org.uk\wwwroot\wp-content\plugins\events-manager\admin\em-admin-modals.php:8 Stack trace: #0 D:\Domains\wmrtss.org.uk\wwwroot\wp-content\plugins\events-manager\admin\em-admin-modals.php(341): EM_Admin_Modals::init() #1 {main} thrown in D:\Domains\wmrtss.org.uk\wwwroot\wp-content\plugins\events-manager\admin\em-admin-modals.php on line 8