Fatal error: Uncaught Error: Class "IXR_Server" not found in D:\XAMPP\htdocs\UTeM\penerbit\wp-includes\class-wp-xmlrpc-server.php:24 Stack trace: #0 {main} thrown in D:\XAMPP\htdocs\UTeM\penerbit\wp-includes\class-wp-xmlrpc-server.php on line 24