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