Fatal error: Uncaught Error: Call to undefined function add_action() in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventON_ALT/includes/admin/class-admin-ajax.php:37 Stack trace: #0 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventON_ALT/includes/admin/class-admin-ajax.php(1348): EVO_admin_ajax->__construct() #1 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventON_ALT/includes/admin/class-admin-ajax.php on line 37