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[Discuss-gnuradio] fm_tx4.py Assertion failure

From: Michael Gray
Subject: [Discuss-gnuradio] fm_tx4.py Assertion failure
Date: Mon, 3 Mar 2008 18:30:05 -0700 (MST)

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?

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