Python: errorCode: "CH_CLIENT_AUTH_FAILURE"

I try to run the github:

After running it, it prints:

Host (Live/Demo):

And then, me if I put my email or the numbers of my demo account (7 digits), I get the following error:

errorCode: "CH_CLIENT_AUTH_FAILURE"

description: "clientId or clientSecret is incorrect"

And that is an old thread:

But it does not help a lot. Any help? I just follow the "hello world" tutorial in ctrader python section: https://spotware.github.io/OpenApiPy/

Is there a better starting point for python?