Hi all,I was simulating filtering.grc example from Digital Modulation Primer 
using GNU Radio by Tom Rondeau. However during execution it gives following 
error. Can anybody help it out.
Executing: "/home/ehsan/mygn/filtering.py"
Traceback (most recent call last):  File "/home/ehsan/mygn/filtering.py", line 
119, in <module>    tb = filtering()  File "/home/ehsan/mygn/filtering.py", 
line 83, in __init__    self.fft_filter_xxx_0 = filter.fft_filter_ccc(1, (), 1) 
 File "/usr/local/lib/python2.7/site-packages/gnuradio/filter/filter_swig.py", 
line 677, in make    return _filter_swig.fft_filter_ccc_make(*args, 
**kwargs)RuntimeError: fft_impl_fftw: invalid fft_size
>>> Done
With RegardsG R Begh
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