# Attribute error

**URL:** <https://www.ruby-forum.com/t/attribute-error/241415>\
**Category:** GNU Radio\
**Created:** [April 5, 2015, 11:56pm UTC](https://www.ruby-forum.com/t/attribute-error/241415 "2015-04-05T23:56:38Z")\
**Posts on this page:** 1\
**Page:** 1

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**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:** [April 5, 2015, 11:56pm UTC](https://www.ruby-forum.com/t/attribute-error/241415/1 "2015-04-05T23:56:38Z")

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hey,

I have been working with Eigen value detection in GNU Radio…I am new to  
this and i get the following error whenever i execute the flowgraph in  
GRC.

File “/home/abhishek/top\_block.py”, line 53, in **init**  
self.howto\_detect\_ff\_0 = howto.detect\_ff(100, 16, 1500)  
AttributeError: ‘module’ object has no attribute ‘detect\_ff’

> > > Done

Any help will be appreciated,  
Thanks in advance,  
Abhishek