NullReferenceException: Object reference not set to an instance of an object is thrown when I want to play award video. What to do?

Question

Unity

I have a problem, when I run Rewarded ad in my application, I get a NullReferenceException: Object reference not set to an instance of an object.

private RewardBasedVideoAd rewardBasedVideo;

    public void Start()
    {
        MobileAds.Initialize(initStatus => { });
        
        this.rewardBasedVideo = RewardBasedVideoAd.Instance;

        this.RequestRewardBasedVideo();

        this.rewardBasedVideo.OnAdLoaded += this.HandleRewardBasedVideoLoaded;
        this.rewardBasedVideo.OnAdFailedToLoad += this.HandleRewardBasedVideoFailedToLoad;
        this.rewardBasedVideo.OnAdOpening += this.HandleRewardBasedVideoOpened;
        this.rewardBasedVideo.OnAdStarted += this.HandleRewardBasedVideoStarted;
        this.rewardBasedVideo.OnAdRewarded += this.HandleRewardBasedVideoRewarded;
        this.rewardBasedVideo.OnAdClosed += this.HandleRewardBasedVideoClosed;
        this.rewardBasedVideo.OnAdLeavingApplication += this.HandleRewardBasedVideoLeftApplication;
    }

    private void RequestRewardBasedVideo()
    {
        string adUnitId = "ca-app-pub-3940256099942544/5224354917";

        AdRequest request = new AdRequest.Builder().Build();
        this.rewardBasedVideo.LoadAd(request, adUnitId);
    }

    public void UserOptToWatchAd()
    {
        if (rewardBasedVideo.IsLoaded())
        {
            rewardBasedVideo.Show();
        }
    }

I did everything as in the guide from Google, but I get this error. If you click on it, it moves to the line "if (rewardBasedVideo.IsLoaded())". Please help me fix this

Answer 1

What version of the plugin do you have in unity?