Google Play Games Error Sign

Hi All, i has been develop an android game, but while i use google play games services plugin i got problem when sign on the games

my script and my debug on logcat
void Start ()
{
PlayGamesClientConfiguration config = new PlayGamesClientConfiguration.Builder()
.EnableSavedGames()
.RequestServerAuthCode(false)
.RequestIdToken()
.Build();

PlayGamesPlatform.InitializeInstance(config);
PlayGamesPlatform.DebugLogEnabled = true;
PlayGamesPlatform.Activate();
}
public void LogIn ()
{
Social.localUser.Authenticate ((bool success) =>
{
if (success) {
Debug.Log (“Login Sucess”);
uitext.text = “succes”;
} else {
Debug.Log (“Login failed”);
uitext.text = “failed”;
}
});
}

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2019… i have the same issue