Fatal error: Uncaught Error: Call to undefined function add_filter() in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/ubermenu/includes/plugin_compatibility/menu-image.php:8 Stack trace: #0 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/ubermenu/includes/plugin_compatibility/menu-image.php on line 8