Thanks for the files. You are missing a closing " in your domain.yml. This makes the domain.yml invalid yaml and then the core training cannot run. Where it says
responses:
utter_hello_worlds:
- text: " this is hello world response
it should instead be
responses:
utter_hello_worlds:
- text: " this is hello world response"
A general tip for future debugging of rasa-related issues: The stuff that is printed to the cmd output in yellow are warnings, which can often give you hints about what’s going wrong.
In this case, there was one that said: UserWarning: Loading domain from 'domain.yml' failed. Using empty domain. Error: 'The provided yaml file is invalid. You can use http://www.yamllint.com/ to validate the yaml syntax of your file.' Running your file through the yaml validator at http://www.yamllint.com/ then showed the issue, that’s how I found it.