Hi all gnuradio users,

I have an error when I try to execute a python script after adding a new block. 

My block is add to a gnuradio 3.7 with gr_modtool with a command : 

gr_modtool add -t sync packet_sinkThe module containing a blocks is 
ieee_868_915. The error is  :

Traceback (most recent call last):
  File "./qa_symbols_to_chips_bs.py", line 25, in <module>
    import ieee_868_915
  File "/usr/local/lib/python2.7/dist-packages/ieee_868_915/__init__.py", line 
45, in <module>
    from ieee_868_915_swig import *
  File 
"/usr/local/lib/python2.7/dist-packages/ieee_868_915/ieee_868_915_swig.py", 
line 26, in <module>
    _ieee_868_915_swig = swig_import_helper()
  File 
"/usr/local/lib/python2.7/dist-packages/ieee_868_915/ieee_868_915_swig.py", 
line 22, in swig_import_helper
    _mod = imp.load_module('_ieee_868_915_swig', fp, pathname, description)
ImportError: /usr/local/lib/libgnuradio-ieee_868_915.so: undefined symbol: 
_ZN2gr6blocks12count_bits16Ej


I tried to delete a lib file libgnuradio-ieee_868_915.so and reinstall all a 
block, but it didn't give a result. 


Please help me to fix this error.

Thank you.
                                          
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