TypeError in Python Processor Extension 'WriteHelloWorld' (example from docs) Due to Unexpected Argument 'jvm'

When trying the example Python extension from here
(https://nifi.apache.org/documentation/nifi-2.0.0-M3/html/python-developer-guide.html), copy-pasted directly into a file called WriteHelloWorld.py in the required directory I get the attached error stating:

TypeError: FlowFileTransform._init_() got an unexpected keyword argument 'jvm'

The attached err.log file has more details of the error.

The custom processor WriteHelloWorld does show up in the list and can be dragged onto the canvas, but fails to load due to the error above.