GPGS Invalid classname Issue

https://github.com/playgameservices/play-games-plugin-for-unity/issues/1197

껏다 키니깐 됨...;;

http://vallista.tistory.com/entry/Unity3D-Google-Play-Game-Service-%EA%B5%AC%EA%B8%80-%ED%94%8C%EB%A0%88%EC%9D%B4-%EA%B2%8C%EC%9E%84-%EC%84%9C%EB%B9%84%EC%8A%A4-%EC%97%B0%EB%8F%99-1

I am building a game for Android with Unity 5, and I have imported this plugin But it's not working properly I followed this tutorial : When I try to post or show leaderboard , it does not show anything .It does not even throw any error. Sign-in and out are working properly.Please help Code : public void LogIn () { Social.localUser.Authenticate ((bool success) => { if (success) { Debug.Log ("Login Sucess"); } else { Debug.Log ("Login failed"); } }); } public void LogOut () { PlayGamesPlatform.Instance.SignOut (); } public void Post () { if (Social.localUser.authenticated) { Social.ReportScore (5000, LeaderbordId, (bool success) => { if (success) { ((PlayGamesPlatform)Social.Active).ShowLeaderboardUI (LeaderbordId); } else { Debug.Log ("Add Score Fail"); } }); } } public void ShowLeader () { Social.ShowLeaderboardUI (); }