Fatal error: Uncaught Error: Class 'WP_Customize_Media_Control' not found in /hosts/rennsteig1.de/wp-includes/customize/class-wp-customize-upload-control.php:17 Stack trace: #0 {main} thrown in /hosts/rennsteig1.de/wp-includes/customize/class-wp-customize-upload-control.php on line 17