Fatal error: Uncaught Error: Class "WP_REST_Controller" not found in D:\XAMPP\htdocs\UTeM\penerbit\wp-includes\rest-api\endpoints\class-wp-rest-widgets-controller.php:17 Stack trace: #0 {main} thrown in D:\XAMPP\htdocs\UTeM\penerbit\wp-includes\rest-api\endpoints\class-wp-rest-widgets-controller.php on line 17