SparkFun RedBoard

I'm wondering if anybody has had any luck getting the SparkFun RedBoard to work with the Embed product?  I've been able to successfully compile and download to an Arduino Uno that I have but have not been able to download to the RedBoard.  I get an error: Can't open Com0.  Check that the Serial Monitor is closed.  I'm trying to use the blinking light test for both of these.  Any insight would be appreciated.

Erich