NullReferenceException: Object reference not set to an instance of an object

Question

Hello everyone, I´m new in unity 3d and I have encountered a problem when trying to show an interstitial ad when the game is over.

I find the following error: "NullReferenceException: Object reference not set to an instance of an object GameManager.ShowAd () (at Assets/Scripts/GameManager.cs:114) GameManager.FinJuegoEnemy () (at Assets/Scripts/GameManager.cs:63)"

I tried a lot of things, but I can find the problem. Please , can you help me?

Thank you very much in advance.

Here is the code:

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 using GoogleMobileAds.Api;
 
 public class GameManager : MonoBehaviour
 {
     public float startDelay;
     public static GameManager instance = null;
     
     public GameObject canvasIntro;
     public GameObject canvasMenu;
     public GameObject gameBoard;
     public GameObject canvasOverEnd;
     Text textEnd;
 
     InterstitialAd interstitial;
     private BannerView bannerView;
 
     void Awake ()
     {
         //Check if instance already exists
         if (instance == null) {
             //if not, set instance to this
             instance = this;
         }
         //If instance already exists and it's not this:
         else if (instance != this) {
             //Then destroy this. This enforces our singleton pattern, meaning there can only ever be one instance of a GameManager.
             Destroy (gameObject);
         }
         //Sets this to not be destroyed when reloading scene
         DontDestroyOnLoad (gameObject);
         canvasIntro.SetActive (true);
         RequestBanner ();
         RequestInterstitial ();
         Invoke ("startMenu", startDelay);
     }
 
     void startMenu ()
     {
         canvasIntro.SetActive (false);
         canvasMenu.SetActive (true);
     }
 
     public void FinJuegoPlayer ()
     {
         gameBoard.SetActive (false);
         canvasOverEnd.SetActive (true);
         textEnd = GameObject.Find ("TextWinLoose").GetComponent<Text> ();
         textEnd.text = "You Win!";
         ShowAd ();
     }
 
     public void FinJuegoEnemy ()
     {
         gameBoard.SetActive (false);
         canvasOverEnd.SetActive (true);
         textEnd = GameObject.Find ("TextWinLoose").GetComponent<Text> ();
         textEnd.text = "Sorry, you lost!";
         ShowAd ();
     }
 
     public void salir ()
     {
         Application.Quit ();
     }
 
     private void RequestBanner ()
     {
         #if UNITY_ANDROID
         string adUnitId = "ca-app-pub-4526259028819910/8305328189";
         #elif UNITY_IPHONE
         string adUnitId = "INSERT_IOS_BANNER_AD_UNIT_ID_HERE";
         #else
         string adUnitId = "unexpected_platform";
         #endif
 
         // Create a 320x50 banner at the bottom of the screen.
         BannerView bannerView = new BannerView (adUnitId, AdSize.Banner, AdPosition.Bottom);
         // Create an empty ad request.
         AdRequest request = new AdRequest.Builder ().Build ();
         // Load the banner with the request.
         bannerView.LoadAd (request);
     }
 
     private void RequestInterstitial ()
     {
         #if UNITY_ANDROID
         string adUnitId = "ca-app-pub-4526259028819910/6688994189";
         #elif UNITY_IPHONE
         string adUnitId = "INSERT_IOS_INTERSTITIAL_AD_UNIT_ID_HERE";
         #else
         string adUnitId = "unexpected_platform";
         #endif
 
         // Initialize an InterstitialAd.
         InterstitialAd interstitial = new InterstitialAd (adUnitId);
         // Create an empty ad request.
         AdRequest request = new AdRequest.Builder ().Build ();
         // Load the interstitial with the request.
         interstitial.LoadAd (request);
     }
 
     public void HideBanner ()
     {
         bannerView.Hide ();
     }
 
     public void ShowAd ()
     {
         if (interstitial.IsLoaded ()) {
             interstitial.Show ();
         }
     }
 }

Answer 1

Best Answer

Answer by jgodfrey · Jun 06, 2016 at 10:03 PM

Your problem is likely here:

 // Initialize an InterstitialAd.
 InterstitialAd interstitial = new InterstitialAd (adUnitId);

You've already declared a class-level variable named "interstitial" of type InterstitialAd near the top of the posted code. I assume that's the variable you're trying assign an object to in the above code. However, since you redeclare the variable type above, that's a brand new, local (and completely different) variable than the one declared at the top.

Since the global variable was never assigned a value (it was assigned to a different, local variable), it's null when you try to reference it in the ShowAd() method.

To fix it, just drop the type in the above code. So...

 // Initialize an InterstitialAd.
 interstitial = new InterstitialAd (adUnitId);

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Answer 2

Answer by eruizr · Jun 07, 2016 at 11:29 AM

Thank you very much. Now it works perfectly.

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naveedkhan358 · Jan 17, 2018 at 07:49 PM 0

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NullReferenceException: Object reference not set to an instance of an object chap2.Game$$anonymous$$anager_Toggle$$anonymous$$enu.Toggle$$anonymous$$enu () (at Assets/$$anonymous$$y script/Chapter2/Game$$anonymous$$anager Script/Game$$anonymous$$anager_Toggle$$anonymous$$enu.cs:52) chap2.Game$$anonymous$$anager_Toggle$$anonymous$$enu.Start () (at Assets/$$anonymous$$y script/Chapter2/Game$$anonymous$$anager Script/Game$$anonymous$$anager_Toggle$$anonymous$$enu.cs:15)

There is my game script..down using System.Collections; using System.Collections.Generic; using UnityEngine;

namespace chap2 { public class Game$$anonymous$$anager_TogglePause : $$anonymous$$onoBehaviour {

     private Game$$anonymous$$anager_$$anonymous$$aster game$$anonymous$$anager$$anonymous$$aster;
     private bool isPaused;

     // Use this for initialization
     void OnEnable ()
     {
         SetInitialReferences ();
         game$$anonymous$$anager$$anonymous$$aster.$$anonymous$$enuToggleEvent += TogglePause;
         game$$anonymous$$anager$$anonymous$$aster.InventoryUIToggleEvent += TogglePause;
     }

     // Update is called once per frame
     void OnDisable ()
     {
         game$$anonymous$$anager$$anonymous$$aster.$$anonymous$$enuToggleEvent -= TogglePause;
         game$$anonymous$$anager$$anonymous$$aster.InventoryUIToggleEvent -= TogglePause;
     }

     void SetInitialReferences()
     {
         game$$anonymous$$anager$$anonymous$$aster = GetComponent<Game$$anonymous$$anager_$$anonymous$$aster> ();
     }

     void TogglePause()
     {
         if (isPaused) {
             Time.timeScale = 1;
             isPaused = false;
         } 
         else 
         {

// Time.timeScale = 0; isPaused = true; } } }

}

and the other script is here using System.Collections; using System.Collections.Generic; using UnityEngine;

namespace chap2 { public class Game$$anonymous$$anager_Toggle$$anonymous$$enu : $$anonymous$$onoBehaviour { private Game$$anonymous$$anager_$$anonymous$$aster game$$anonymous$$anager$$anonymous$$aster; public GameObject menu;

     // Use this for initialization
     void Start () 
     {
         Toggle$$anonymous$$enu ();
     }

     // Update is called once per frame
     void Update () 
     {
         CheckFor$$anonymous$$enuToggleRequest ();
     }

     void OnEnabled()
     {
         SetInitialReferences ();
         game$$anonymous$$anager$$anonymous$$aster.GameOverEvent += Toggle$$anonymous$$enu;
     }

     void OnDisabled()
     {
         game$$anonymous$$anager$$anonymous$$aster.GameOverEvent -= Toggle$$anonymous$$enu;
     }

     void SetInitialReferences()
     {
         game$$anonymous$$anager$$anonymous$$aster = GetComponent<Game$$anonymous$$anager_$$anonymous$$aster> ();
     }

     void CheckFor$$anonymous$$enuToggleRequest()
     {
         if (Input.Get$$anonymous$$eyUp ($$anonymous$$eyCode.Escape) && !game$$anonymous$$anager$$anonymous$$aster.isGameOver && !game$$anonymous$$anager$$anonymous$$aster.isInventoryUIOn) 
         {
             Toggle$$anonymous$$enu ();
         }
     }

     void Toggle$$anonymous$$enu()
     {
         if (menu != null) {
             menu.SetActive (!menu.activeSelf);
             game$$anonymous$$anager$$anonymous$$aster.is$$anonymous$$enuOn = !game$$anonymous$$anager$$anonymous$$aster.is$$anonymous$$enuOn;
             game$$anonymous$$anager$$anonymous$$aster.CallEvent$$anonymous$$enuToggle ();
         } 
         else 
         {
             Debug.LogWarning("You need to assign a UI GameObject to the Toggle $$anonymous$$enu script in the inspector.");
         }
     }
 }

}

Answer 3

Answer by kadirkoca · Jul 04, 2019 at 05:30 PM

You request ads before Mobile ads. initialized.

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NullReferenceException: Object reference not set to an instance of an object

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