Fatal error: Uncaught Error: Class "WP_Customize_Panel" not found in D:\XAMPP\htdocs\UTeM\penerbit\wp-includes\customize\class-wp-customize-nav-menus-panel.php:19 Stack trace: #0 {main} thrown in D:\XAMPP\htdocs\UTeM\penerbit\wp-includes\customize\class-wp-customize-nav-menus-panel.php on line 19