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