GNU radio error AD9375 ZC706

Hi 

I am building a GNU radio which communicates with 9375 with the evaluation board ZC706 from Analog Devices. 

I get the following error.

Executing: /usr/bin/python -u /home/usrg/gnuradio/gr-iio/iio-examples/top_block.py

Using Volk machine: avx2_64_mmx_orc
Traceback (most recent call last):
File "/home/usrg/gnuradio/gr-iio/iio-examples/top_block.py", line 152, in <module>
main()
File "/home/usrg/gnuradio/gr-iio/iio-examples/top_block.py", line 141, in main
tb = top_block_cls(interpolation=options.interpolation, uri=options.uri, wav_file=options.wav_file)
File "/home/usrg/gnuradio/gr-iio/iio-examples/top_block.py", line 54, in __init__
self.iio_fmcomms2_sink_0_0 = iio.fmcomms2_sink_f32c(uri, fm_station, samp_rate, 20000, True, False, 0x8000, False, "A", 10.0, 10.0, "", True)
File "/usr/lib/python2.7/dist-packages/gnuradio/iio/iio_swig.py", line 312, in make
return _iio_swig.fmcomms2_sink_f32c_make(*args, **kwargs)
RuntimeError: Device not found

I need to modify the FMComms2/3/4 blocks (sink and source). Which files I need to touch  and What is the steps I need to follow, so that my FMComms block can communicate with the board.

thanks