Fatal error: Uncaught Error: Call to undefined function add_action() in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/clever-fox/inc/accron/features/accron-service.php:288 Stack trace: #0 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/clever-fox/inc/accron/features/accron-service.php on line 288