Sharing folders

[Nuno Lopes]

I am trying to share a folder but everytime i try. I get 

{

  "error": {

    "errors": [

      {

        "domain": "global",

        "reason": "notFound",

        "message": "File not found: 0B...................Y1E",

        "locationType": "other",

        "location": "file"

      }

    ],

    "code": 404,

    "message": "File not found: 0B...................iY1E"

  }

}


The file exists and if I generate the Bearer token using the web playground it works but if generate using the service account code here :
https://developers.google.com/api-client-library/ruby/auth/service-accounts 

it fails

I already tried every combination of the following scopes 

    'https://www.googleapis.com/auth/drive',

    'https://www.googleapis.com/auth/drive.file',

    'https://www.googleapis.com/auth/drive.appdata',

    'https://www.googleapis.com/auth/drive.metadata',

    'https://www.googleapis.com/auth/drive.metadata'

I need to generate the oauth token without  user interaction because is going to be run on a server