Fatal error: Uncaught Error: Call to undefined function add_action() in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/ubermenu/includes/customizer/custom.menu-items.php:43 Stack trace: #0 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/ubermenu/includes/customizer/custom-styles.php(3): require_once() #1 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/ubermenu/includes/customizer/custom.menu-items.php on line 43