NullReferenceException: Object reference not set to an instance of an object Gley.MobileAds.Internal.MobileAdsManager.Initialize

Unity Engine
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1

**I am working on my FYP so Kindly help me out **
Using Gley Ads package for Ads This same code work file in an other game of mine but not on this one the ads prefab is Instantiate but the Ads manager script is SetActive(False) it is suppose to be active

Error
NullReferenceException: Object reference not set to an instance of an object
Gley.MobileAds.Internal.MobileAdsManager.Initialize (UnityEngine.Events.UnityAction completeMethod) (at Assets/Gley/MobileAds/Scripts/Internal/MobileAdsManager.cs:153)
Gley.MobileAds.API.Initialize (UnityEngine.Events.UnityAction completeMethod) (at Assets/Gley/MobileAds/Scripts/ToUse/APIMobileAds.cs:16)
AdManager.Awake () (at Assets/Gley/AdManager.cs:12)
UnityEngine.Object:Instantiate(GameObject)
Home:Start() (at Assets/Scripts/Home/Home.cs:70)

Code
using UnityEngine;
using System;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
public class Home : MonoBehaviour
{
public GameObject PlayBtn, SettingBtn, ShopBtn;
public GameObject SettingPnl, ExitPnl, LevelPnl, ShopPnl, HighScoreBoard;
public Text HighScore ;

private bool isPnlOpen = false;
[Header("UI Pnl's")]
public GameObject CurPnl;

[Header("Prefabs")]
public GameObject Sound;
public GameObject Ads;

[Header("Setting")]
public Image[] SettingIcons;
public Sprite[] OnOffIcon;

void Awake()
{
    if (!GlobalValues.isPrefabsActice)
    {
        DontDestroyOnLoad(Instantiate(Ads));
        DontDestroyOnLoad(Instantiate(Sound));
        GlobalValues.isPrefabsActice = true;
    }
    iTween.ScaleTo(PlayBtn, iTween.Hash("scale", Vector3.one, "time", 0.5f, "easetype", "spring", "delay", 0.2f, "oncomplete", nameof(LowerBar), "oncompletetarget", gameObject));
    InitialSetting();
}
public void Update()
{
    if (Input.GetKeyDown(KeyCode.Escape))
    {
        if (CurPnl.activeSelf == true)
            closepanel(CurPnl);
        else
            if (ExitPnl.activeInHierarchy == false)
            openPanel(ExitPnl);
    }
}

private void Start()
{
    HighScore.text = GlobalValues.isHighScore.ToString();
}
2

This is one of the most common topics on here, there is a sticky at the top of the forum.
Expose all your variables (make them public) if they’re not already and see which one has no value. When it’s running, which one has no value?

3

This NullRef appears to be deep within the library’s initialization, which can often be from incorrect usage of a library: not setting it up correctly, forgetting a step, etc.

Whatever you did to get it working in the other game, I suggest you revisit that workflow and doublecheck that you did 100% of it in this game.

Alternately, since it works in one game and doesn’t work in the other, you may need to bisect between the two to find out what is going on.