Fatal error: Uncaught Error: Class "WP_Customize_Setting" not found in C:\xampp\htdocs\alumni-rmutr\wp-includes\customize\class-wp-customize-nav-menu-setting.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\alumni-rmutr\wp-includes\customize\class-wp-customize-nav-menu-setting.php on line 21