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Adalm Pluto 2nd Receive channel not working


When trying the example of dual Tx Rx for adalm pluto from Jon Kraft's channel, i keep getting the PyAdi error:
Exception: Channel voltage2 not found.

I did already ssh into pluto and did: fw_setenv mode ad9361,,,,,, fw_setenv compatible ad9361, and i established rf connection via u.fl - sma cables from the board to the 2 additional antennas.

But i keep getting the ''Exception: Channel voltage2 not found."  in python.  Can anyone please help me????  The adalm pluto is a rev C.