Object reference not set to an instance of an object ?

"NullReferenceException: Object reference not set to an instance of an object
SoundFX.InCorrectCollision () (at Assets/Scripts/SoundFX.cs:23)
CollisionScript.OnCollisionEnter2D (UnityEngine.Collision2D col) (at Assets/Scripts/CollisionScript.cs:16)"

Code (CSharp):

1.  
2. public void InCorrectCollision()
3.     {
4.         PlaySound(1);
5.         ScoreSystem.manager.GameOverScore();
6.         Bannerad.manager.ShowBanner();
7.     }
8.  

I'm getting the error for "Bannerad.manager.ShowBanner();"
This is the BannerScript:

Code (CSharp):

1.  
2. using UnityEngine;
3. using GoogleMobileAds.Api;
4.  
5. public class Bannerad : MonoBehaviour
6. {
7.     public static Bannerad manager;
8.     private BannerView bannerView;
9.     bool Showing = false;
10.  
11.     void Awake()
12.     {
13.         RequestBanner();
14.         manager = this;
15.  
16.         if (Showing == false)
17.         {
18.             bannerView.Show();
19.             Showing = true;
20.             return;
21.         }
22.     }
23.  
24.  
25.     void RequestBanner()
26.     {
27. #if UNITY_ANDROID
28.         string adUnitId = "ca-app-pub-xxxxxxxxxxxxxxxxxxxxxxxxx";
29. #elif UNITY_IPHONE
30.         string adUnitId = "INSERT_IOS_BANNER_AD_UNIT_ID_HERE";
31. #else
32.         string adUnitId = "unexpected_platform";
33. #endif
34.  
35.         bannerView = new BannerView(adUnitId, AdSize.SmartBanner, AdPosition.Bottom);
36.         AdRequest request = new AdRequest.Builder()
37.         .AddTestDevice(AdRequest.TestDeviceSimulator)      
38.         .AddTestDevice("xxxxxxxxxxxxxx")  
39.         .Build();
40.         bannerView.LoadAd(request);
41.        
42.     }
43.  
44.     public void ShowBanner()
45.     {
46.         bannerView.Show();
47.         Showing = true;
48.         return;
49.     }
50.  
51.     public void CloseAD()
52.     {
53.         bannerView.Hide();
54.         bannerView.Destroy();
55.         Showing = false;
56.         RequestBanner();
57.         Debug.Log("Banner Hidden, Destroyed and a new one is requested.");
58.         return;
59.     }
60. }
61.  

I randomly seem the get the Null error and I think its the reason my Banner is not being shown on my mobile it worked perfectly then it stopped showing, not sure at all why I'm getting the error:/
Thanks in advance.

 

Hello

"NullReferenceException" means that the object you want to use is null (not assigned to an instance).
Bannerad.manager.ShowBanner();
--> in that case i guess manager is the issue. I see the manager = this assignement, but i can tell if the var is erased by a null value somewhere, or just never initialized because Bannerad Component is not in the scene. Follow that manager var and you should find where exactly is the issue.

 

It might be because the script is attached the the main camera in my main menu scene and the ShowBanner is called from my Level scene which does not have script attached the main camera but this worked fine before the update and I didn't read anything about that change?

 

if you've loaded a new scene and that scene doesn't have the script in it, and the previous script isn't covered by a "dontdestroyonload" statement, then the instance has been destroyed by the scene load. As far as i know that is the same under "scenemanager" and "application" scene loads (i.e. new and old approaches).... it'd be interesting if it behaves differently now

 

dang I just made another thread about 1 camera vs 2 where I talk about dontdestroyonload. Before the update I never used that and didn't get any null errors so I was confused but yeah I get the null error because the BannerView script is "destroyed"