[Discuss-gnuradio] Problem with USRP B200

[Henning Bredenberg]

Hi all,

i just started to work with GNU-Radio-Companion (v3.7.2). I finally  
got my USRP B200 connected and what im trying now is using the "UHD:  
USRP Source" block in grc to receive radio frequencies as a first  
step. Pretty easy stuff i guess.
I tried different things, but grc still comes up with the same Error:
"RuntimeError: ValueError: Could not resolve device hint "" to a  
single device."

Since i tried different things and it still doesn't work, i think  
there has to be a structural mistake. If someone could take a few  
seconds and tell me where the mistake is, i would be very grateful.

best regards!