Benchmark_tx.py which is in digital-bert folder

I am using USRP2 kits and RFX2400 daughterboard, and Linux operating
system.
i am able to benchmark_tx.py which is in digital folder, and i had
installed
gnuradio from synaptic manager.
But when I am running benchmark_tx.py which is in digital-bert folder
i am
getting the following error.

Modulation: 250k bits/sec
TX IF rate: 500k samples/sec
USRP interpolation: 256
DAC amplitude: 2000
usrp: failed to find usrp[0]
Traceback (most recent call last):
File “./benchmark_tx.py”, line 106, in
tb = tx_bpsk_block(options)
File “./benchmark_tx.py”, line 52, in init
options.freq)
File “./benchmark_tx.py”, line 58, in _setup_usrp
self._usrp = usrp.sink_c(which=which, interp_rate=interp)
File “/usr/lib/python2.6/dist-packages/gnuradio/usrp/usrp_swig.py”,
line
2469, in sink_c
return _usrp_swig.sink_c(*args, **kwargs)
RuntimeError: can’t open usrp


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