Unity Google Play Service Plugin Social.localUser.Authenticate(…) App Crash

Unity3d Code for Google Play Service.I am using GooglePlayGamesPlugin-0.9.36 and Unity 5.4

 using UnityEngine;
     using System.Collections;
     using UnityEngine.SocialPlatforms;
     using GooglePlayGames;
 
 public class MainGui : MonoBehaviour
 {
     private const float FontSizeMult = 0.05f;
     private bool mWaitingForAuth = false;
     private string mStatusText = "Ready.";
     private bool dumpedToken = false;
 void Start()
 {
     // Select the Google Play Games platform as our social platform implementation
     PlayGamesPlatform.Activate();
 }
 
 void OnGUI()
 {
     GUI.skin.button.fontSize = (int)(FontSizeMult * Screen.height);
     GUI.skin.label.fontSize = (int)(FontSizeMult * Screen.height);
 
     GUI.Label(new Rect(20, 20, Screen.width, Screen.height * 0.25f),
               mStatusText);
 
     Rect buttonRect = new Rect(0.25f * Screen.width, 0.10f * Screen.height,
                       0.5f * Screen.width, 0.25f * Screen.height);
     Rect imageRect = new Rect(buttonRect.x + buttonRect.width / 4f,
                               buttonRect.y + buttonRect.height * 1.1f,
                               buttonRect.width / 2f, buttonRect.width / 2f);
 
     if (mWaitingForAuth)
     {
         return;
     }
 
     string buttonLabel;
 
 
     if (Social.localUser.authenticated)
     {
         buttonLabel = "Sign Out";
         if (Social.localUser.image != null)
         {
             GUI.DrawTexture(imageRect, Social.localUser.image,
                             ScaleMode.ScaleToFit);
         }
         else {
             GUI.Label(imageRect, "No image available");
         }
 
         mStatusText = "Ready";
 
         if (!dumpedToken)
         {
             string token = GooglePlayGames.PlayGamesPlatform.Instance.GetToken();
 
             Debug.Log("AccessToken = " + token);
             dumpedToken = token != null && token.Length > 0;
         }
     }
     else {
         buttonLabel = "Authenticate";
     }
 
     if (GUI.Button(buttonRect, buttonLabel))
     {
         if (!Social.localUser.authenticated)
         {
             // Authenticate
             mWaitingForAuth = true;
             mStatusText = "Authenticating...";
             Social.localUser.Authenticate((bool success) =>
             {
                 mWaitingForAuth = false;
                 if (success)
                 {
                     mStatusText = "Welcome " + Social.localUser.userName;
                 }
                 else {
                     mStatusText = "Authentication failed.";
                 }
             });
         }
         else {
             // Sign out!
             mStatusText = "Signing out.";
             ((GooglePlayGames.PlayGamesPlatform)Social.Active).SignOut();
         }
     }
     }
 }

App crash when I Press Authenticate Button.And Google Play Service Dialog does not appear.I have build the app and run it in Android Mobile.

 02-25 20:18:42.181: A/DEBUG(583): pid: 23421, tid: 23439, name: main  >>> devnp.testing <<<
 02-25 20:18:42.197: W/debuggerd(583): type=1400 audit(0.0:35378): avc: denied { search } for name="devnp.testing" dev="dm-1" ino=141182 scontext=u:r:debuggerd:s0 tcontext=u:object_r:app_data_file:s0:c512,c768 tclass=dir permissive=0
 02-25 20:18:42.260: A/DEBUG(583):     #11 pc 0009221b  /data/app/devnp.testing-1/lib/arm/libgpg.so
 02-25 20:18:42.260: A/DEBUG(583):     #12 pc 00092e37  /data/app/devnp.testing-1/lib/arm/libgpg.so
 02-25 20:18:42.261: A/DEBUG(583):     #13 pc 000933dd  /data/app/devnp.testing-1/lib/arm/libgpg.so
 02-25 20:18:42.261: A/DEBUG(583):     #14 pc 0008dc69  /data/app/devnp.testing-1/lib/arm/libgpg.so (_ZNK3gpg28AndroidPlatformConfiguration5ValidEv+76)
 02-25 20:18:42.261: A/DEBUG(583):     #15 pc 00053441  /data/app/devnp.testing-1/lib/arm/libgpg.so (_ZN3gpg12GameServices7Builder6CreateERKNS_28AndroidPlatformConfigurationE+40)
 02-25 20:18:42.261: A/DEBUG(583):     #16 pc 000c73dd  /data/app/devnp.testing-1/lib/arm/libgpg.so (GameServices_Builder_Create+16)
 02-25 20:18:43.054: W/ActivityManager(1439):   Force finishing activity devnp.testing/com.unity3d.player.UnityPlayerActivity
 02-25 20:18:43.233: I/ActivityManager(1439): Process devnp.testing (pid 23421) has died
 02-25 20:18:43.234: W/InputDispatcher(1439): channel 'd1b52d4 devnp.testing/com.unity3d.player.UnityPlayerActivity (server)' ~ Consumer closed input channel or an error occurred.  events=0x9
 02-25 20:18:43.234: E/InputDispatcher(1439): channel 'd1b52d4 devnp.testing/com.unity3d.player.UnityPlayerActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
 02-25 20:18:43.237: I/WindowState(1439): WIN DEATH: Window{d1b52d4 u0 devnp.testing/com.unity3d.player.UnityPlayerActivity}
 02-25 20:18:43.237: W/InputDispatcher(1439): Attempted to unregister already unregistered input channel 'd1b52d4 devnp.testing/com.unity3d.player.UnityPlayerActivity (server)'