# Wrong when I run uhd\_fft

**URL:** <https://www.ruby-forum.com/t/wrong-when-i-run-uhd-fft/251171>\
**Category:** GNU Radio\
**Created:** [November 26, 2018, 3:09am UTC](https://www.ruby-forum.com/t/wrong-when-i-run-uhd-fft/251171 "2018-11-26T03:09:48Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tony41](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/4bbf92/32.png) [@tony41](https://www.ruby-forum.com/u/tony41)\
**Post date:** [November 26, 2018, 3:09am UTC](https://www.ruby-forum.com/t/wrong-when-i-run-uhd-fft/251171/1 "2018-11-26T03:09:49Z")

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Hello  
When I run uhd\_fft and I get errors below,what should I do next ? I’ve tried adding libUHD to the LD\_LIBRARY\_PATH，and ldconfig, but this error still exists.  
tjf@tjf:~$ uhd\_fft  
Traceback (most recent call last):  
File “/usr/bin/uhd\_fft”, line 48, in \<module\>  
from gnuradio import uhd  
File “/usr/lib/python2.7/dist-packages/gnuradio/uhd/ **init**.py”, line 135, in \<module\>  
\_prepare\_uhd\_swig()  
File “/usr/lib/python2.7/dist-packages/gnuradio/uhd/ **init**.py”, line 38, in \_prepare\_uhd\_swig  
import uhd\_swig  
File “/usr/lib/python2.7/dist-packages/gnuradio/uhd/uhd\_swig.py”, line 28, in \<module\>  
\_uhd\_swig = swig\_import\_helper()  
File “/usr/lib/python2.7/dist-packages/gnuradio/uhd/uhd\_swig.py”, line 24, in swig\_import\_helper  
\_mod = imp.load\_module(’\_uhd\_swig’, fp, pathname, description)  
ImportError: /usr/lib/python2.7/dist-packages/gnuradio/uhd/\_uhd\_swig.x86\_64-linux-gnu.so: undefined symbol: \_ZN3uhd11time\_spec\_t15get\_system\_timeEv

Thank you !