# Gnuradio + itpp error

**URL:** <https://www.ruby-forum.com/t/gnuradio-itpp-error/230505>\
**Category:** GNU Radio\
**Created:** [June 20, 2014, 5:00pm UTC](https://www.ruby-forum.com/t/gnuradio-itpp-error/230505 "2014-06-20T17:00:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [June 20, 2014, 5:00pm UTC](https://www.ruby-forum.com/t/gnuradio-itpp-error/230505/1 "2014-06-20T17:00:44Z")

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* * *

Discuss-gnuradio mailing list  
removed\_email\_address@domain.invalid  
[https://lists.gnu.org/mailman/listinfo/discuss-gnuradio](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio)

---

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**Author:** ![squeegy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/dec6dc/32.png) [@squeegy](https://www.ruby-forum.com/u/squeegy)\
**Post date:** [June 21, 2014, 8:20am UTC](https://www.ruby-forum.com/t/gnuradio-itpp-error/230505/2 "2014-06-21T08:20:19Z")

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Hello Alex,

On 20 Jun 2014, at 16:59, Alex W. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> ```
> _mod = imp.load_module('_ieee802_11_swig', fp, pathname, description)
> 
> ```
> 
> ImportError: /usr/local/lib/libgnuradio-ieee802\_11.so: undefined symbol:  
> \_ZN4itpp9ModulatorISt7complexIdEEC1Ev

maybe check the output of

ldd /usr/local/lib/libgnuradio-ieee802\_11.so

and assert that libtipp.so is in LD\_LIBRARY\_PATH.

Best,  
Bastian