Fatal error: Uncaught Error: Class 'WP_Customize_Setting' not found in /home/qwerasd1234/public_html/tom-test/wp-includes/customize/class-wp-customize-custom-css-setting.php:19
Stack trace:
#0 {main}
thrown in /home/qwerasd1234/public_html/tom-test/wp-includes/customize/class-wp-customize-custom-css-setting.php on line 19