Android : Google Cloud Save Exception : com.google.api.client.googleapis.json.GoogleJsonResponseException: 404 Not Found

Hello friends i starting learn about google cloud save, so i create apps and follows step given in google.developer and i am also using their example using link https://github.com/GoogleCloudPlatform/solutions-mobile-backend-starter-android-client and https://developers.google.com/cloud/samples/mbs/android/ but i think i face some problem in autentication, and got error com.google.api.client.googleapis.json.GoogleJsonResponseException: 404 Not Found

i just want to store my game score using google cloud save.please any one can give me solution about it or any related links ? thanks in advance.