# Volk error **URL:** \ **Category:** GNU Radio\ **Created:** [November 1, 2014, 9:10am UTC](https://www.ruby-forum.com/t/volk-error/232870 "2014-11-01T09:10:02Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [November 1, 2014, 9:10am UTC](https://www.ruby-forum.com/t/volk-error/232870/1 "2014-11-01T09:10:02Z")
Hello all, I have a c++ code containing “filter::fir\_filter\_ccc”, is built successfully, but there is an error when I run it due this filter: symbol lookup error: /usr/local/lib/libgnuradio-filter-3.7.5.so.0.0.0: undefined symbol: volk\_malloc What is the problem and what can I do to foil it? Best, Mostafa ---
**Author:** ![mostafa\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/5e9695/32.png) [@mostafa\_a](https://www.ruby-forum.com/u/mostafa_a)\ **Post date:** [November 2, 2014, 2:52pm UTC](https://www.ruby-forum.com/t/volk-error/232870/2 "2014-11-02T14:52:44Z")
I have also tested that this is fine to use ‘decimating fir filter’ in GRC but I don’t know why I got this error on c++: symbol lookup error: /usr/local/lib/libgnuradio-filter-3.7.5.so.0.0.0: undefined symbol: volk\_malloc Is there a library link error which causes this unknown error? PLZ help me I can’t go further till this error being solved. Best, Mostafa On Sat, Nov 1, 2014 at 11:38 AM, Mostafa A. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Best, > > Mostafa – * * * Department of Electrical Engineering Aboureyhan Building MMWCL LAB Amirkabir University Of Technology Tehran IRAN Tel: +98 (919) 158-7730 LAB: [http://ele.aut.ac.ir/~mmwcl/?page\_id=411](http://ele.aut.ac.ir/~mmwcl/?page_id=411) Homepage: [http://ele.aut.ac.ir/~alizadeh/](http://ele.aut.ac.ir/~alizadeh/) * * *