Fatal error: Uncaught Error: Class 'WP_Customize_Control' not found in /var/www/clients/client0/web9/web/wp-includes/customize/class-wp-sidebar-block-editor-control.php:18 Stack trace: #0 {main} thrown in /var/www/clients/client0/web9/web/wp-includes/customize/class-wp-sidebar-block-editor-control.php on line 18