Fatal error: Uncaught Error: Class "WP_REST_Controller" not found in C:\xampp\htdocs\wordpress\wp-includes\rest-api\endpoints\class-wp-rest-url-details-controller.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wordpress\wp-includes\rest-api\endpoints\class-wp-rest-url-details-controller.php on line 18