Warning: require_once(//lib/classes/class.CmsException.php) [function.require-once]: failed to open stream: No such file or directory in /include.php on line 60

Fatal error: require_once() [function.require]: Failed opening required '//lib/classes/class.CmsException.php' (include_path='.:/:/usr/local/php5/lib/pear') in /include.php on line 60