Fatal error: Uncaught Error: Class 'WP_Customize_Setting' not found in D:\htdocs2\a-resultat.dk\wp-includes\customize\class-wp-customize-custom-css-setting.php:19
Stack trace:
#0 {main}
thrown in D:\htdocs2\a-resultat.dk\wp-includes\customize\class-wp-customize-custom-css-setting.php on line 19