Hi Mario, Welcome to GNU Radio!
On 29/10/2021 01.08, Mario Moran wrote: > AttributeError: module 'tutorial' has no attribute 'my_qpsk_demod_cb' Usually this error indicates undefined symbol/reference in the OOT's shared object (.so) file. To find our the exact problem go to your OOT's build directory, execute `ldd -r lib/*.so` and provide the full output. Also to improve the error handling in python/__init__.py change ImportError to ModuleNotFoundError. Then rebuild, reinstall and run you flowgraph. See also https://github.com/gnuradio/gnuradio/issues/4761 Regards, Vasil
