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 43

Warning: include_once() [function.include]: Failed opening '//wp-includes/class-IXR.php' for inclusion (include_path='.:/:/usr/local/php/pear5') in /xmlrpc.php on line 43

Fatal error: Class 'IXR_Server' not found in /xmlrpc.php on line 72