Hi I moved server over the last few days and am getting this error when using the debug error-logging too

[05-Nov-2009 16:33:16] PHP Fatal error: Class 'queryFactoryResult' not found in /usr/local/pem/vhosts/118405/webspace/siteapps/9461/htdocs/includes/classes/db/mysql/query_factory.php on line 331
[05-Nov-2009 16:33:16] PHP Fatal error: Class 'queryFactoryResult' not found in /usr/local/pem/vhosts/118405/webspace/siteapps/9461/htdocs/includes/classes/db/mysql/query_factory.php on line 331


Could anyone tell me what might be causing this? Is it something wrong with that php file or might it be something to do with the server?

Thanks.