Getting "referenced unknown base type gr::block"

[Nikoloz Glonti]

Hi everyone,

I have newest gnuradio 3.10, and I'm compiling example QPSK block - 
https://wiki.gnuradio.org/index.php?title=Guided_Tutorial_GNU_Radio_in_C%2B%2B
But when trying to run it i get following error.

  File 
"/home/ng/Desktop/bloczki/gr-spektralsi/build/python/testFiltru.py", 
line 35, in <module>
    from gnuradio import pec
  File 
"/usr/local/lib/python3.10/site-packages/gnuradio/pec/__init__.py", line 
18, in <module>
    from .pec_python import *
ImportError: generic_type: type "qpsk_demod_cb" referenced unknown base 
type "gr::block"

How can i fix it?

Thank You in advance
Niko