On Fri, Apr 5, 2013 at 8:29 AM, Tom Rondeau <t...@trondeau.com> wrote:
> On Fri, Apr 5, 2013 at 1:31 AM, Manu T S <manu.t.s...@gmail.com> wrote: > > Executing the attached flow graph I get the following error. > > > > > ##################################################################################### > >>>> gr_fir_ccc: using SSE > > Traceback (most recent call last): > > File "/home/manu/coding/top_block.py", line 72, in <module> > > tb.Run(True) > > File > > > "/usr/local/lib/python2.7/dist-packages/grc_gnuradio/wxgui/top_block_gui.py", > > line 76, in Run > > self.start() > > File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py", > > line 97, in start > > self._tb.start(max_noutput_items) > > File > > > "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/gnuradio_core_runtime.py", > > line 3077, in start > > return _gnuradio_core_runtime.gr_top_block_sptr_start(self, > > max_noutput_items) > > RuntimeError: gr_buffer_add_reader: nzero_preload must be >= 0 > > > ####################################################################################### > > > > What could be the possible reason? > > > > I have installed using build-gnuradio script on day before yesterday. > > > > > > > > -- > > Manu T S > > Manu, > > You have to give the interpolator taps. It can't run without a filter > defined. > > The error message could definitely be much better. "RuntimeError: gr_buffer_add_reader: nzero_preload must be >= 0" Even to an experienced person, without seeing the flow graph, that error doesn't mean anything. Debugging a large flow graph might be like looking for a needle in a haystack. As a side note, what error gets thrown when this is in a straight C++ application? Is it more informative or equally as ambiguous? Is it possible to get the filter to throw the assertion/error versus the runtime? Brian
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