Ah okay.

You need to create the keys.key JSON file seperately using a text editor, following the format I provided in the article, ie `{"consumer_key": "your_API key", "consumer_secret": "your_API_secret_key", "access_token": "your_access_token", "access_secret": "your_secredt_access_token"}

If you have done this and the code still breaks, please create an issue and post the details on the Github repo, I'd really appreciate that.

You could also definte credentials as a dictionary literal with those entries and skip making a file entirely, but then be careful not to post your code anywhere without removing it.