Warning: require_once(includes/config.in.php) [function.require-once]: failed to open stream: No such file or directory in /home/www/mainfile.php on line 22

Fatal error: require_once() [function.require]: Failed opening required 'includes/config.in.php' (include_path='.:/usr/share/pear:/usr/share/php') in /home/www/mainfile.php on line 22