Error Loading Transformation

I'm running both processes (on MacOS) without any issue to start up AToMPM version 0.9.0:
- node httpwsd.js
- python3 mt/main.py

But when I want to load in a transformation I receive the following error
> 500:could not connect to model transformation worker!
please ensure the worker is running!

However when I go to http://localhost:8125/ I do see the message
> missing worker id

This means that I can connect to the python process however something still seems to be blocked so that I can't load a transformation.

Start by tracing transformation loading through node httpwsd.js and python3 mt/main.py, then reproduce the failure while checking the worker endpoint at http://localhost:8125/. Done means loading a transformation succeeds without the 500 error and the worker connection works as expected.

Written by the indexing model from the issue text.