public override void OnRewardedAdFailedToLoad(LoadAdError error)
 {
     base.OnRewardedAdFailedToLoad(error);
     AdFailedToLoad?.Invoke(_adUnit, new AdMobErrorEventArgs()
     {
         Code = error?.Code, Domain = error?.Domain, Message = error?.Message, FullStacktrace = error?.ToString()
     });
     Console.WriteLine($"OnRewardedAdFailedToLoad({_adUnit})");
 }
 public override void OnAdFailedToLoad(int errorCode)
 {
     base.OnAdFailedToLoad(errorCode);
     AdFailedToLoad?.Invoke(this, null);
 }