Warning: require_once(lib/api/xmlrpc.class.php) [function.require-once]: failed to open stream: No such file or directory in /usr/local/apache/htdocs/testlink/lib/api/sample_extended_server/extended_server.php on line 15

Fatal error: require_once() [function.require]: Failed opening required 'lib/api/xmlrpc.class.php' (include_path='.:/usr/local/php/lib/php') in /usr/local/apache/htdocs/testlink/lib/api/sample_extended_server/extended_server.php on line 15