A new version of Rasa Core was released changing the modules used in bot.py. This library hence is old and may not work.
https://github.com/RasaHQ/rasa_core/blob/master/CHANGELOG.rst
https://forum.rasa.com/t/rasa-core-sdk-live-stream/826
I am creating another tutorial with the newer version. Stay tuned. Refer to for the framework and template scripts: