Fatal error: Uncaught Error: Call to undefined function add_action() in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-waitlist/includes/class-frontend.php:14 Stack trace: #0 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-waitlist/includes/class-frontend.php(250): EVORSW_Front->__construct() #1 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-waitlist/includes/class-frontend.php on line 14