Can't create room using play-games-plugin

I am developing multiplayer game using play-games-plugin-for-unity. At present I can able to login with Google Play Services but when I am trying to create room it shows following message on console.

I have used following code for room creating purpose.

             const int MinOpponents = 1, MaxOpponents = 1;
             const int GameVariant = 0;
             PlayGamesPlatform.Instance.RealTime.CreateQuickGame(MinOpponents, MaxOpponents,
                         GameVariant, this);

I can't able to create game on server. I need some help in this.