I'm trying to get an installation of googlecheckout working again. It was working fine for a few months. The store owner doesn't know what changed.

This is the error in a debug file. This error is a new one to me. Anyone have any ideas?

[19-Jan-2011 17:57:03] PHP Warning: include_once(/home/username/public_html/website.com/includes/languages/english/modules/shipping/2010_usps.php) [<a href='function.include-once'>function.include-once</a>]: failed to open stream: No such file or directory in /home/username/public_html/website.com/googlecheckout/gcheckout.php on line 371
[19-Jan-2011 17:57:03] PHP Warning: include_once() [<a href='function.include'>function.include</a>]: Failed opening '/home/username/public_html/website.com/includes/languages/english/modules/shipping/2010_usps.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/username/public_html/website.com/googlecheckout/gcheckout.php on line 371
[19-Jan-2011 17:57:03] PHP Fatal error: Class '2010_usps' not found in /home/username/public_html/website.com/googlecheckout/gcheckout.php on line 375

any help would be appreciated. Thanks