(Crash) on calling Google Authentication

using UnityEngine.SocialPlatforms;

void Authentication() {

Social.localUser.Authenticate((bool success) => {
     if (success)
     {
	Debug.Log("You've successfully logged in.");
     }
     else
     {
        Debug.Log("Login failed for some reason.");
     }
});

}

Adding the authentication into OnStart it crashes my application. I’ve loaded Social plugin to Unity.

[Play Games Plugin DLL] 04/10/15 18:33:39 +03:00 DEBUG: Activating PlayGamesPlatform.
[Play Games Plugin DLL] 04/10/15 18:33:39 +03:00 DEBUG: PlayGamesPlatform activated: GooglePlayGames.PlayGamesPlatform

Calling Authentication onStart just crashes the application. I would like to move into new project, but kinda getting fkup about this hassle. I just wanted to try authentication first instead of showing anything about leaderboard to see if I’m done everything right.

Work your way through the instructions on this page:

In your case it could be, that you just need to call the following prior to running the Authenticate command:

PlayGamesPlatform.Activate();

same problem. crash when trying to call for Google Authentication… followed everything step by step. cant find the error in adb log file…