Hi,
When you import the package with Python3.8, it looks for the package that under the Python3.6 and leads to the error.
Could you try the below command to see if it works?
echo 'export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH' >> ~/.bashrc
echo 'export PYTHONPATH=/usr/local/lib/python3.8/site-packages/:$PYTHONPATH' >> ~/.bashrc
source ~/.bashrc
Thanks.