Warning: include_once(//wp-includes/class-IXR.php) [function.include-once]: failed to open stream: No such file or directory in /xmlrpc.php on line 36

Warning: include_once() [function.include]: Failed opening '//wp-includes/class-IXR.php' for inclusion (include_path='.:/usr/local/lib/php') in /xmlrpc.php on line 36

Fatal error: Class 'IXR_Server' not found in /xmlrpc.php on line 66