Ad Placements RewardAds issue

Unity Engine
1

Hi! I try to follow the official tutorial. I don’t know what I did wrong for the reward ads. I have to placement already. There are two errors. first one is at starting.
ArgumentException: Ad Placement named ContinueRewardedAd does not exist.
Then when I click on button
NullReferenceException: Object reference not set to an instance of an object
TempButton.DisplayVideo () (at Assets/Scripts/TempButton.cs:29)

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using GoogleMobileAds;
using GoogleMobileAds.Api;
using GoogleMobileAds.Placement;
public class TempButton : MonoBehaviour
{
    List<string> deviceIds = new List<string>();
    RewardedAdGameObject RewardAds;
    void Start()
    {
        RewardAds = MobileAds.Instance.GetAd<RewardedAdGameObject>("ContinueRewardedAd");
        RewardAds.LoadAd();
        this.gameObject.SetActive(true);
        deviceIds.Add("2077ef9a63d2b398840261c8221a0c9b");
        RequestConfiguration requestConfiguration = new RequestConfiguration.Builder().SetTestDeviceIds(deviceIds).build();
        MobileAds.SetRequestConfiguration(requestConfiguration);
        MobileAds.Initialize((initStatus) => {
            Debug.Log("Initialized MobileRewardAds");
        });

    }
    public void DisplayVideo()
    {
       // RewardAds.LoadAd();
        RewardAds.ShowIfLoaded();
     
    }
}

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2

The function MobileAds.Instance.GetAd(“GameObject_name”) takes the name of the GameObject (with a RewardedAdGameObject-script attached) as argument.
Your GameObject is called “Rewarded Ad” instead of “ContinueRewardedAd”…
=> MobileAds.Instance.GetAd(“Rewarded Ad”) should work.

3

One more thing to bear in mind if you fiddle with Script Execution Order. GoogleMobileAds scripts have to be called before yours