Fatal error: Uncaught Error: Class "WP_Customize_Control" not found in /home/pacs/vcg00/users/compgen.de/wordpress/wp-includes/customize/class-wp-sidebar-block-editor-control.php:18 Stack trace: #0 {main} thrown in /home/pacs/vcg00/users/compgen.de/wordpress/wp-includes/customize/class-wp-sidebar-block-editor-control.php on line 18