[Discuss-gnuradio] e310 and uhd_tx_dpsk

I am trying to run uhd_tx_dpsk from an e310, but I am getting the following
error:

<<< Welcome to GNU Radio Companion 3.7.9 >>>

Preferences file: /home/root/.gnuradio/grc.conf
Block paths:
/usr/local/share/gnuradio/grc/blocks
/home/root/.grc_gnuradio
/usr/share/gnuradio/grc/blocks

Loading: "/usr/share/gnuradio/examples/uhd/uhd_tx_dpsk.grc"
>>> Done

Showing: "/usr/share/gnuradio/examples/uhd/uhd_tx_dpsk.grc"

Generating: '/usr/share/gnuradio/examples/uhd/uhd_tx_dpsk.py'

Executing: '/usr/bin/python -u
/usr/share/gnuradio/examples/uhd/uhd_tx_dpsk.py'

linux; GNU C++ version 4.9.2; Boost_105700; UHD_003.009.002-0-unknown

Traceback (most recent call last):
File "/usr/share/gnuradio/examples/uhd/uhd_tx_dpsk.py", line 262, in
<module>
main()
File "/usr/share/gnuradio/examples/uhd/uhd_tx_dpsk.py", line 250, in main
tb = top_block_cls(address=options.address, gain=options.gain,
samp_rate=options.samp_rate, freq=options.freq)
File "/usr/share/gnuradio/examples/uhd/uhd_tx_dpsk.py", line 93, in
__init__
channels=range(1),
File "/usr/lib/python2.7/site-packages/gnuradio/uhd/__init__.py", line
122, in constructor_interceptor
return old_constructor(*args)
File "/usr/lib/python2.7/site-packages/gnuradio/uhd/uhd_swig.py", line
2034, in make
return _uhd_swig.usrp_sink_make(*args)
RuntimeError: i2c_zc_impl recv timeout

>>> Done (return code 1)

My image is release-4. The problem is with the UHD: USRP Sink since I can
remove the block and it executes fine. The same issue happens with USRP
Source block. I can execute the tx_wavefors example, and it seems to
execute fine.


What am I missing about the USRP Sink/Source blocks with regards to the
e310? Many thanks!