Error installing spectrometer_w_cal.grc

I am trying to install spectrometer_w_calc.grc 

on a raspberrypi 4B running 

Raspbian GNU/Linux 10 (buster)

GNU Radio Companion v3.8.3.1-4-gafa3b031 (Python 3.7.3)

ModuleNotFoundError: No module named '_osmosdr_swig'

I am using an Osmocom block with an airspy

Thank you,

Robert Baker