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Al's picture

Hi, from the error it looks like it can't find your dongle. From a terminal prompt try running:
$~ rtl_test
With my E4000 device I get:

Found 1 device(s):
0: ezcap USB 2.0 DVB-T/DAB/FM dongle

Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle
Found Elonics E4000 tuner
Supported gain values (14): -1.0 1.5 4.0 6.5 9.0 11.5 14.0 16.5 19.0 21.5 24.0 29.0 34.0 42.0
Reading samples in async mode...

If you get a 'No supported devices found' this page is a good start for installing the library (look under 'Building the software')

Hopefully the next commit will have better error checking.