Im trying to test the YouTube API v3 Example from Google.
I downloaded the testfiles from GitHub:
Then i filled in the client_id and client_secret in client_secrets.json (src/main/recourses)
also i filled in the API key in the file (src/main/recourses). Im using Eclipse.

Then i tried to run the file.. But i getting the follow error:

Java Code:
    IOException: 400 Bad Request
      "error" : "unauthorized_client"
    } 400 Bad Request
      "error" : "unauthorized_client"
What is the problem? My client_id and client_secret are correct..
I create these on the Developer Console from Google =>

Here the overview

And in the API page

Can you help me?
Thank you!