[Discuss-gnuradio] "USB open failed: insufficient permissions"

[Mercado, Alejandra]

Dear all,

I am attempting to recreate the FM receiver in GnuRadio described in wiki: 

https://kb.ettus.com/Implementation_of_a_Simple_FM_Receiver_in_GNU_Radio

... duly replacing all WX with QT...

It seems a simple enough example, as seen here:

And I see no errors in making the Python code. But when I attempt to   I get this error:

Executing: '/usr/bin/python2 -u /home/mercado/workarea-gnuradio/gnuradio/ENTS622/Lab_2_FM_RX.py'

linux; GNU C++ version 5.4.0 20160609; Boost_105800; UHD_003.009.007-0-g50839059

UHD Error:

    USB open failed: insufficient permissions.

    See the application notes for your device.

Traceback (most recent call last):

  File "/home/mercado/workarea-gnuradio/gnuradio/ENTS622/Lab_2_FM_RX.py", line 250, in <module>

    main()

  File "/home/mercado/workarea-gnuradio/gnuradio/ENTS622/Lab_2_FM_RX.py", line 238, in main

    tb = top_block_cls()

  File "/home/mercado/workarea-gnuradio/gnuradio/ENTS622/Lab_2_FM_RX.py", line 80, in __init__

    channels=range(1),

  File "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/__init__.py", line 122, in constructor_interceptor

    return old_constructor(*args)

  File "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py", line 2671, in make

    return _uhd_swig.usrp_source_make(*args)

RuntimeError: LookupError: KeyError: No devices found for ----->

Empty Device Address

>>> Done

Any suggestions?