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Ad load errors
When an ad fails to load, an OnFailedToLoad delegate is broadcast which provides a LoadAdError struct.
The following example shows the information available when an ad fails to load:
#include "GoogleAdMobAdError.h"
// ...
void UYourClass::OnFailedToLoad(const FGoogleAdMobAdError& LoadAdError, const FGoogleAdMobResponseInfo& ResponseInfo)
{
LoadAdError.Code;
LoadAdError.Message;
LoadAdError.Domain;
LoadAdError.Cause.Code;
LoadAdError.Cause.Message;
LoadAdError.Cause.Domain;
LoadAdError.FullError;
}

For errors under the domain com.google.admob on iOS and com.google.android.gms.ads on Android, the message can be looked up in the Resolve common onboarding issues article for a more detailed explanation and possible actions that can be taken to resolve the issue.