Fatal error: Uncaught Error: Class "WP_Widget_Block" not found in /var/www/clients/client24/web19/web/wp-includes/class-wp-widget-factory.php:100 Stack trace: #0 /var/www/clients/client24/web19/web/wp-includes/widgets.php(123): WP_Widget_Factory->register() #1 /var/www/clients/client24/web19/web/wp-includes/widgets.php(1888): register_widget() #2 /var/www/clients/client24/web19/web/wp-includes/class-wp-hook.php(286): wp_widgets_init() #3 /var/www/clients/client24/web19/web/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters() #4 /var/www/clients/client24/web19/web/wp-includes/plugin.php(453): WP_Hook->do_action() #5 /var/www/clients/client24/web19/web/wp-settings.php(450): do_action() #6 /var/www/clients/client24/web19/web/wp-config.php(78): require_once('...') #7 /var/www/clients/client24/web19/web/wp-load.php(38): require_once('...') #8 /var/www/clients/client24/web19/web/wp-blog-header.php(13): require_once('...') #9 /var/www/clients/client24/web19/web/index.php(17): require('...') #10 {main} thrown in /var/www/clients/client24/web19/web/wp-includes/class-wp-widget-factory.php on line 100