Have I been Hacked

Suddenly when I go to my site I get this:

Warning: require_once(/home/.lembu/ricland/newsquick.net/wp-admin/includes/upgrade.php) [function.require-once]: failed to open stream: No such file or directory in /home/.lembu/ricland/newsquick.net/wp-content/plugins/eht-photos/Admin.php on line 6

Fatal error: require_once() [function.require]: Failed opening required ‘/home/.lembu/ricland/newsquick.net/wp-admin/includes/upgrade.php’ (include_path=’.:/usr/local/php5/lib/php:/usr/local/lib/php’) in /home/.lembu/ricland/newsquick.net/wp-content/plugins/eht-photos/Admin.php on line 6