Fatal error: Uncaught Error: Class "WP_Customize_Setting" not found in /home/pacs/vcg00/users/compgen.de/wordpress/wp-includes/customize/class-wp-customize-filter-setting.php:19
Stack trace:
#0 {main}
thrown in /home/pacs/vcg00/users/compgen.de/wordpress/wp-includes/customize/class-wp-customize-filter-setting.php on line 19