# Terminate called after throwing an instance of 'std::invalid\_argument' **URL:** \ **Category:** GNU Radio\ **Created:** [June 12, 2015, 7:54am UTC](https://www.ruby-forum.com/t/terminate-called-after-throwing-an-instance-of-std-invalid-argument/242292 "2015-06-12T07:54:57Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Post date:** [June 12, 2015, 7:54am UTC](https://www.ruby-forum.com/t/terminate-called-after-throwing-an-instance-of-std-invalid-argument/242292/1 "2015-06-12T07:54:57Z")
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](http://gnuradio.4.n7.nabble.com/file/n54156/AM_test.grc) – View this message in context: [http://gnuradio.4.n7.nabble.com/terminate-called-after-throwing-an-instance-of-std-invalid-argument-tp54156.html](http://gnuradio.4.n7.nabble.com/terminate-called-after-throwing-an-instance-of-std-invalid-argument-tp54156.html) Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com). ---
**Author:** ![shaunwang](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/5e9695/32.png) [@shaunwang](https://www.ruby-forum.com/u/shaunwang)\ **Post date:** [June 12, 2015, 3:42pm UTC](https://www.ruby-forum.com/t/terminate-called-after-throwing-an-instance-of-std-invalid-argument/242292/2 "2015-06-12T15:42:56Z")
On Fri, Jun 12, 2015 at 1:32 AM, shaunwang [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Shaun AM\_test.grc \<[http://gnuradio.4.n7.nabble.com/file/n54156/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 ---
**Author:** ![shaunwang](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/5e9695/32.png) [@shaunwang](https://www.ruby-forum.com/u/shaunwang)\ **Post date:** [June 12, 2015, 4:10pm UTC](https://www.ruby-forum.com/t/terminate-called-after-throwing-an-instance-of-std-invalid-argument/242292/3 "2015-06-12T16:10:23Z")
Thank you so much. Tom Could you please tell me what a typical value in tabs is? – View this message in context: [http://gnuradio.4.n7.nabble.com/terminate-called-after-throwing-an-instance-of-std-invalid-argument-tp54156p54164.html](http://gnuradio.4.n7.nabble.com/terminate-called-after-throwing-an-instance-of-std-invalid-argument-tp54156p54164.html) Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com). ---
**Author:** ![shaunwang](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/5e9695/32.png) [@shaunwang](https://www.ruby-forum.com/u/shaunwang)\ **Post date:** [June 12, 2015, 4:31pm UTC](https://www.ruby-forum.com/t/terminate-called-after-throwing-an-instance-of-std-invalid-argument/242292/4 "2015-06-12T16:31:25Z")
Dear Shaunwag, that depens on the bandwidth you want to let through your filter, but typically, use something like firdes.low\_pass(1.0, samp\_rate, 25e3, 25e3) which will build a tap vector for you; the arguments (in this order) are: 1. gain in passband 2. sampling rate 3. cutoff frequency of pass band in Hz 4. transition with between pass- and stop band Generally, you should have a bit of fun with the tool that you as “gr\_filter\_design”; it gives you a good feeling for what kind of filters make sense (e.g. when you try to filter out 25kHz out of a 10MHz input stream with a single FIR filter using the method described above, you’d get a ~1000 taps filter. And no noone should expect their CPU to compute that in real time.), and where you can allow your filter to have a bit more of “slack”. Best regards, Marcus ---
**Author:** ![likhil](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/bcef8e/32.png) [@likhil](https://www.ruby-forum.com/u/likhil)\ **Post date:** [April 3, 2019, 12:12pm UTC](https://www.ruby-forum.com/t/terminate-called-after-throwing-an-instance-of-std-invalid-argument/242292/5 "2019-04-03T12:12:51Z")
Hi, how to create taps? and how to add it?