[Discuss-gnuradio] fm_tx4.py Assertion failure

[Michael Gray]

I'm attempting to run the fm_tx4.py sample.  The code aborts with the 
following error:

python: /usr/include/boost/shared_ptr.hpp:253: 
T* boost::shared_ptr<T>::operator->() const [with T = gr_basic_block]: 
Assertion `px != 0' failed.


The same error occurs when built with gnuradio-3.1.1.tar.gz or latest SVN 
development checkout.  

The other transmit examples (signal generator) and usrp_nbfm_ptt.py work
fine with the hardware.


I tried the python debugger, but that didn't really help since the error 
was occuring down in the boost C++ code.  My guess is it has something to 
do with reading the audio files.  

Running Ubuntu LTS 6.x 

2.6.15-51-server #1 SMP Tue Feb 12 17:12:18 UTC 2008 i686 GNU/Linux


Any ideas?