Hi esperdiv,
The first steps would be to double check that all the wiring is correct. Did you plug the Eigenharp cable into the instrument slot on the basestation and not the extension slot? Is the USB cable connected to both the basestation and your computer? Are all connections a tight fit? Finally, I've had the housing of connectors on the instrument cable slightly unscrew once, causing the pins to not come out enough, you might want to check if that's not the case and if it is you can fix it by simply turning the housing until it's fully screwed back.
Hope this helps,
Geert
Eigenlabs Software Team