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