Unity-谷歌游戏服务不工作?

好吧,所以我以前已经成功地在很多游戏中实现了GPGS,但现在似乎行不通了。我加载了游戏,它不会做任何事情,没有登录对话框或任何事情。这是我用来登录的代码:

using UnityEngine;
using System.Collections;
using UnityEngine.SocialPlatforms;
using GooglePlayGames;
using GooglePlayGames.BasicApi;

public class GpgsStart : MonoBehaviour {


void Start () {
        PlayGamesPlatform.Activate ();
        Social.localUser.Authenticate((bool success) => {
            if(!success)
            {
                PlayerPrefs.SetString("SignIn", "false");
                Debug.Log("Couldn't Sign In");
            }
        });
    }

    // Update is called once per frame
    void Update () {

    }
}

我真的不明白为什么它不起作用,我想知道是我犯了一个愚蠢的错误还是我错过了什么。有人知道是什么导致了我的问题吗?

非常感谢您的帮助,谢谢。

这是logcat输出:

I/Unity   ( 9861): InvalidOperationException: There was an error creating a Game
Services object. Check for log errors from GamesNativeSDK
I/Unity   ( 9861):   at GooglePlayGames.Native.PInvoke.GameServicesBuilder.Build
 (GooglePlayGames.Native.PInvoke.PlatformConfiguration configRef) [0x00000] in <
filename unknown>:0
I/Unity   ( 9861):   at GooglePlayGames.Native.NativeClient.InitializeGameServic
es () [0x00000] in <filename unknown>:0
I/Unity   ( 9861):   at GooglePlayGames.Native.NativeClient.Authenticate (System
.Action`1 callback, Boolean silent) [0x00000] in <filename unknown>:0
I/Unity   ( 9861):   at GooglePlayGames.PlayGamesPlatform.Authenticate (System.A
ction`1 callback, Boolean silent) [0x00000] in <filename unknown>:0
I/Unity   ( 9861):   at GooglePlayGames.PlayGamesPlatform.Authenticate (System.A
ction`1 callback) [0x00000] in <filename unknown>:0
I/Unity   ( 9861):   at GooglePlayGames.PlayGamesLocalUser.Authenticate (System.
Action`1 callback) [0x00000] in <filename unknown>:0
I/Unity   ( 9861):   at GpgsStart.Start () [0x00000] in <filename unknown>:0
I/Unity   ( 9861):
I/Unity   ( 9861): (Filename:  Line: -1)
I/Unity   ( 9861):
V/WindowManager(  451): Window{422852e8 u0 Keyguard}mOrientationRequetedFromKeyg
uard=false