Or you can add this USB to serial cable. We do not recommend substituting. We know the FTDI works and there are many cheap crap cables that have problems. lynxmotion.com/Product.aspx? … egoryID=44
If you install a card you will never see the error again. But if you go the cable route you must plug the cable in (creates a serial port) before you start the program or the error will happen again.