Invalid_client: The Oauth Client Was Not Found. Python

I have an old project, that is trying to retrieve data from google analytics. It is not working, so I am trying to figure out what's wrong. Found an example code to work with Analy

Solution 1:

When you registered the application on Google developer console you created some OAuth credentials.

invalid_client: The OAuth client was not found

means that the client id you are using isn't there anymore someone probably deleted it. You will need to create new credentials.