Fatal error: Uncaught Error: Class 'WP_Widget' not found in /home/zjakub33/public_html/matijestkoks/wp-includes/widgets/class-wp-nav-menu-widget.php:17 Stack trace: #0 {main} thrown in /home/zjakub33/public_html/matijestkoks/wp-includes/widgets/class-wp-nav-menu-widget.php on line 17