On Fri, Jun 12, 2015 at 1:32 AM, shaunwang <shaunwangford...@gmail.com>
wrote:

> Hello Everyone
>
> When I run AM radio GRC, I got this error
> terminate called after throwing an instance of 'std::invalid_argument'
>   what():  buffer_add_reader: nzero_preload must be >= 0
>
> I google this error, and it says this is bug 693. but I cannot fix it.
> Thank
> you!
>
> Shaun AM_test.grc <http://gnuradio.4.n7.nabble.com/file/n54156/AM_test.grc
> >
>

Shaun,

You need to specify taps for the filter in the Frequency Xlating FIR Filter
block. It's a flaw in the validation step of GRC that it doesn't properly
check that a vector is empty. But the filter won't work without you
defining it.

Tom
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