You'll need to verify your settings in ADMIN. It is trying to connect via a com port that you don't have. Despite the fact that this message box will continually pop up, just keep ignoring it and go to the settings link at the top of the options bar. Go down to port setup. Make sure that you have this set to match your local serial port. The other settings, such as baud rate, etc. should not need to be changed.
Last but not least, make sure that you are using a null-modem cable.
