# Warning: restarting the docstring loader (crashed while loading 'uhd\_usrp\_sink')

**URL:** <https://www.ruby-forum.com/t/warning-restarting-the-docstring-loader-crashed-while-loading-uhd-usrp-sink/244823>\
**Category:** GNU Radio\
**Created:** [June 21, 2016, 4:42pm UTC](https://www.ruby-forum.com/t/warning-restarting-the-docstring-loader-crashed-while-loading-uhd-usrp-sink/244823 "2016-06-21T16:42:23Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rafa\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/958977/32.png) [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\
**Post date:** [June 21, 2016, 4:42pm UTC](https://www.ruby-forum.com/t/warning-restarting-the-docstring-loader-crashed-while-loading-uhd-usrp-sink/244823/1 "2016-06-21T16:42:23Z")

</div>

Hi,

I recently installed the latest version of Gnuradio  
(v3.7.9.2-279-gd7eaf6e1) using the following procedure:

sudo apt-get install git  
sudo apt-get install cmake  
sudo apt-get install python-pip  
sudo pip install -U pip  
sudo pip install PyBOMBS  
sudo pybombs prefix init /usr/local -a usrlocal  
sudo pybombs config default\_prefix /usr/local  
sudo pybombs recipes add gr-recipes  
git+https://github.com/gnuradio/gr-recipes.git  
sudo pybombs recipes add gr-etcetera  
git+https://github.com/gnuradio/gr-etcetera.git  
sudo apt-get update  
sudo pybombs install uhd gnuradio  
sudo ldconfig  
sudo apt-get install gnuradio

I have a problem with the UHD block, in fact when I run

optirun gnuradio-companion

I obtain the following warnings:

Warning: restarting the docstring loader (crashed while loading  
‘uhd\_amsg\_source’)  
Warning: restarting the docstring loader (crashed while loading  
‘uhd\_usrp\_sink’)  
Warning: restarting the docstring loader (crashed while loading  
‘uhd\_usrp\_source’)

If I try to use a UHD block, gnuradio crashes.

If I try to open gnuradio without bubblebee I can use all the blocks,  
but when I use the USRP with the ‘uhd usrp sink’ block I obtain a lot of  
Underun and then gnuradio crashes.

Do you have any clue?

Thanks in advance.