# Unable to link to fir\_filter\_ccc update tap method

**URL:** <https://www.ruby-forum.com/t/unable-to-link-to-fir-filter-ccc-update-tap-method/240661>\
**Category:** GNU Radio\
**Created:** [April 24, 2014, 5:12pm UTC](https://www.ruby-forum.com/t/unable-to-link-to-fir-filter-ccc-update-tap-method/240661 "2014-04-24T17:12:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [April 24, 2014, 5:12pm UTC](https://www.ruby-forum.com/t/unable-to-link-to-fir-filter-ccc-update-tap-method/240661/1 "2014-04-24T17:12:19Z")

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Hello,

I wrote some code that uses fir filter\_ccc::update\_tap method.

The code compiles in Gnuradio but when I try to run it in python, I get  
this error:

ImportError: /usr/local/lib/libgnuradio-adaptive\_filter.so: undefined  
symbol:  
\_ZN2gr6filter6kernel14fir\_filter\_ccc10update\_tapESt7complexlfEj

My understanding is python is unable to link to the update\_tap method  
but my code was able to compile in c++. What am I exactly doing that’s  
wrong?

Thanks.