Google services user authentification crashes game.

Hello. I wanted to implement leaderboard from google service so I decided to look at some tutorial like this: Google Play Games Services Tutorial (Unity) #1 - ACHIEVEMENTS and LEADERBOARDS - YouTube

I did everything like on this video, but when i will build my game and copy to my mobile and install it and run, it crashes. Someone can give me some explanation on this? It is crashin on this line of code:

 void SignIn() {
        Social.localUser.Authenticate((bool success) => {
            if (success) {
                Debug.Log("Login Sucess");
            else {
                Debug.Log("Login failed");

I used actual plugin for this services: GooglePlayGamesPlugin-0.9.50.unitypackage

Yes. It works in the editor.