Missing critical module: "gnuradio.gr.hier_block2"

Hello all

I’m trying to execute the graphical interface since several days from
the
command promnt but I get the following error:

Missing critical module: “gnuradio.gr.hier_block2”

Exiting!

I tried to import such a file from gnuradio_swig_python but in vain!
could
someone help me to solve that?

Thank you in advance

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