Eric, and Michael,

Eric Blossom wrote:
On Mon, Mar 03, 2008 at 09:57:09AM -0600, Qi Chen wrote:
Michael,

On Mar 3, 2008, at 8:33 AM, Michael Dickens wrote:

On Mar 2, 2008, at 9:28 PM, Qi Chen wrote:
ImportError: /usr/local/lib/python2.4/site-packages/gnuradio/gr/_gnuradio_swig_py_runtime.so: undefined symbol: _ZN28gr_single_threaded_scheduler4stopEv

This is often a symptom of multiple partially corrupt installations.

To recover, find all places where you may have installed GNU Radio and
remove all relevant files, then rebuild and install.

E.g.,

  $ sudo rm /usr/local/lib/libgnuradio*
  $ sudo rm /usr/local/lib/libusrp*
  $ sudo rm -fr /usr/local/lib/python2.4/site-packages/gnuradio
  $ sudo rm -fr /usr/local/lib/python2.4/site-packages/usrp*

I have done exactly what you mentioned above, and it worked. I didn't reconfigure the whole thing, all I did was to sudo make install.

Thanks for both of your help.

Eric



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