Admob rewarded ads problem

When I try to use rewarded ads, the application crashes after the ad is finished.

Code (CSharp):

1.     private void LoadRewardBasedAd(){
2.         #if UNITY_EDITOR
3.             string adUnitId = "unused";
4.         #elif UNITY_ANDROID
5.             string adUnitId = "ca-app-pub-4368344866239036/5911893731";
6.         #else
7.             string adUnitId = "unexpected_platform";
8.         #endif
9.         rewardBasedVideoAd.LoadAd(new AdRequest.Builder().Build(), adUnitId);
10.     }
11.     public void HandleOnAdLoaded(object sender,EventArgs args){
12.         //ready_text.text = "Ad Has Been Loaded";
13.         rewardBasedVideoAd.Show();
14.     }
15.     public void HandleOnAdFailedToLoad(object sender,AdFailedToLoadEventArgs args){
16.         LoadRewardBasedAd();
17.         //try to load
18.         //ready_text.text = "failed to load";
19.     }
20.     public void HandleOnAdOpening(object sender,EventArgs args){
21.         //Pause the action
22.         //ready_text.text = "Ad Has Been Opened";
23.     }
24.     public void HandleOnAdStarted(object sender,EventArgs args){
25.     //mute the audio
26.     //ready_text.text = "Ad Has Been Started";
27.     }
28.     public void HandleOnAdClosed(object sender,EventArgs args){
29.  
30.     }
31.     public void HandleOnAdRewarded(object sender,Reward args){
32.         rewarded.SetActive(true);
33.     }
34.     public void HandleOnAdLeavingApplication(object sender,EventArgs args){
35.        
36.     }

 

Use lastest
-Unity
-ndk
-all SDK tools in Android Studio
-Google Adsmob .unitypackage
-Play Service Resolver

That should be fine if you use lastest version.

If it's not working try to clean your project about ADS then re-import.