Fatal error: Uncaught Error: Class 'WP_Widget' not found in /home/wmichal67/public_html/lekcjatest-1v-mw/wp-includes/widgets/class-wp-widget-search.php:17 Stack trace: #0 {main} thrown in /home/wmichal67/public_html/lekcjatest-1v-mw/wp-includes/widgets/class-wp-widget-search.php on line 17