I get this error when I go into reservation management

Fatal error: Module_Reservation::require_once() [function.require]: Failed opening required '/home/highgio0/public_html/LMS/doceboLms/admin/class.module/../modules/reservation/reservation.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/highgio0/public_html/LMS/doceboLms/admin/class.module/class.reservation.php on line 29

Thanks
Joe