Fatal error: Uncaught Error: Class "WP_Widget" not found in C:\xampp\htdocs\canman.ee\wp-includes\widgets\class-wp-nav-menu-widget.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\canman.ee\wp-includes\widgets\class-wp-nav-menu-widget.php on line 17