Error USRP

Hello,
I am new in the GNU Radio community and OpenBTS and I am looking for
some
help to get started. if I do:
cd /usr/share/gnuradio/examples/python/usrp
./usrp_benchmark_usb.py
I unfortunately get this:

Testing 2MB/sec… usrp: failed to find usrp[0]
Traceback (most recent call last):
File “./usrp_benchmark_usb.py”, line 106, in
main ()
File “./usrp_benchmark_usb.py”, line 96, in main
ok = run_test (rate, verbose)
File “./usrp_benchmark_usb.py”, line 63, in run_test
usrp_tx = usrp.sink_s (0, tx_interp)
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/usrp/usrp_swig.py”,
line 2742, in sink_s
return _usrp_swig.sink_s(*args, **kwargs)
RuntimeError: can’t open usrp

…and i’m sure that i’m in group usrp…please HELP ME!

Thanks!!

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