I fixed this by doing the below. For whatever reason the upgrade command didn't install the correct packages. Hopefully this can help someone in a similar situation.
wget https://raw.githubusercontent.com/apache/incubator-superset/master/requirements.txt pip install -r requirements.txt [ Full content available at: https://github.com/apache/incubator-superset/issues/5788 ] This message was relayed via gitbox.apache.org for [email protected]
