Fatal error: Uncaught Error: Call to undefined function add_filter() in /var/www/mode/wp-content/plugins/events-manager/admin/em-admin-modals.php:8 Stack trace: #0 /var/www/mode/wp-content/plugins/events-manager/admin/em-admin-modals.php(341): EM_Admin_Modals::init() #1 {main} thrown in /var/www/mode/wp-content/plugins/events-manager/admin/em-admin-modals.php on line 8