You are using some old and new packages. We replaced rasa-core and rasa-nlu with a package called rasa. I would recommend to install rasa (Installation) and try again together with rasa-sdk. You can remove the other packages (pip uninstall rasa-core rasa-nlu rasa-core-sdk).
I think you don’t need to modify any code (at lease the action looks good), however you should use different commands to start the bot:
# Start the action server via
rasa run actions
# Run Rasa via
rasa run --debug
Also you should retrain your model before starting Rasa via rasa train. Does that help?