# AttributeError: 'module' object has no attribute 'square\_ff'

**URL:** <https://www.ruby-forum.com/t/attributeerror-module-object-has-no-attribute-square-ff/226898>\
**Category:** GNU Radio\
**Created:** [February 25, 2013, 6:43am UTC](https://www.ruby-forum.com/t/attributeerror-module-object-has-no-attribute-square-ff/226898 "2013-02-25T06:43:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![omero72](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/2acd7d/32.png) [@omero72](https://www.ruby-forum.com/u/omero72)\
**Post date:** [February 25, 2013, 6:43am UTC](https://www.ruby-forum.com/t/attributeerror-module-object-has-no-attribute-square-ff/226898/1 "2013-02-25T06:43:01Z")

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hi everyone,i have made my own block in gnuradio name square\_ff  
from out of tree module.i hsvr successfully interfaced it  
withgnuradio.but problem is when i want to use that block in gnuradio  
then the following error i get in terminal.  
AttributeError: ‘module’ object has no attribute ‘square\_ff’.  
kindly help me

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<div class="post-metadata">

**Author:** ![omero72](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/2acd7d/32.png) [@omero72](https://www.ruby-forum.com/u/omero72)\
**Post date:** [February 25, 2013, 5:40pm UTC](https://www.ruby-forum.com/t/attributeerror-module-object-has-no-attribute-square-ff/226898/2 "2013-02-25T17:40:23Z")

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Someone can correct me if I’m wrong, but I think this is the error that  
happens if you haven’t run `ldconfig` (on Ubuntu).

Try `sudo ldconfig` There’s a gnuradio wiki page that explains what it  
does  
somewhere.