Fatal error: Uncaught Error: Class "IXR_Client" not found in D:\XAMPP\htdocs\UTeM\penerbit\wp-includes\class-wp-http-ixr-client.php:9 Stack trace: #0 {main} thrown in D:\XAMPP\htdocs\UTeM\penerbit\wp-includes\class-wp-http-ixr-client.php on line 9