Hi Gerard. Did you happen to do a pip install of tabpy-server? If not, this may be your issue.
pip install tabpy-server
There was an occasional complication with tabpy_tools which was resolved recently, and should no longer be an obstacle on version 0.3.1 or later. If you still are having difficulty with the latest version, please let us know. You can find it here: Releases · tableau/TabPy · GitHub
Excellent! Glad we got things up and running again for you, Gérard!