Cant sign in from my build to google play

I have integrated Google Play Services to my game and when I build the app, run it on my device, I cant log in to Google Play

using UnityEngine;

using System.Collections;

using GooglePlayGames; using GooglePlayGames.BasicApi; using UnityEngine.SocialPlatforms; using System.Collections.Generic; using UnityEngine.UI; public class LBDemo : MonoBehaviour { public string leaderboard; public Text loginText; public Text leaderboardText; public Text logoutText; void Start () { PlayGamesClientConfiguration config = new PlayGamesClientConfiguration (); PlayGamesPlatform.InitializeInstance (config); PlayGamesPlatform.Activate (); PlayGamesPlatform.DebugLogEnabled = true; logoutText.text = "initialized";

 }
 public void LogIn ()
 {
     Social.localUser.Authenticate ((bool success) =>
         {
             if (success) {
                 loginText.text = "Login success";
             } else {
                 loginText.text = "Login failed";
             }
         });
 }
 public void OnShowLeaderBoard ()
 {
     if (Social.localUser.authenticated) {
         Social.ShowLeaderboardUI (); // Show all leaderboard
         //((PlayGamesPlatform)Social.Active).ShowLeaderboardUI (leaderboard); // Show current (Active) leaderboard
     } else {
         leaderboardText.text = "Login Failed";
     }
 }
 public void OnAddScoreToLeaderBorad (long score)
 {
     if (Social.localUser.authenticated) {
         Social.ReportScore (score, leaderboard, (bool success) =>
             {
                 if (success) {
                     Debug.Log ("Update Score Success");

                 } else {
                     Debug.Log ("Update Score Fail");
                 }
             });
     }
 }
 public void OnLogOut ()
 {
     ((PlayGamesPlatform)Social.Active).SignOut ();
 }

}

[1]: /storage/temp/78125-ss3.jpg

[2]: /storage/temp/78124-ss1.jpg