Warning: require_once(DB.php) [function.require-once]: failed to open stream: No such file or directory in /var/lib/mclib/mc_navigator.inc.php on line 7

Fatal error: require_once() [function.require]: Failed opening required 'DB.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/lib/mclib/mc_navigator.inc.php on line 7