Fatal error: Uncaught Error: Class "WP_Widget" not found in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-full-cal/includes/class-evo-fc-widget.php:12 Stack trace: #0 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-full-cal/includes/class-evo-fc-widget.php on line 12