I just moved to a new server and one of my sites came up with this while others are fine. I would appreciate the assistance. Thanks.

Fatal error: require_once() [function.require]: Failed opening required 'Zend/Cache/Backend/File.php' (include_path='.:/home/siteid/public_html/include/:/home/siteid/public_html/include/PEAR/:.:/usr/lib/php:/usr/local/lib/php') in /home/siteid/public_html/include/Zend/Cache.php on line 132