GADPresentationErrorCode
enum GADPresentationErrorCode : NSInteger {}Error codes in the Google Mobile Ads SDK domain that surface due to errors when attempting to present an ad.
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                  Ad isn’t ready to be shown. DeclarationSwift case codeAdNotReady = 15Objective-C GADPresentationErrorCodeAdNotReady = 15
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                  Ad is too large for the scene. DeclarationSwift case codeAdTooLarge = 16Objective-C GADPresentationErrorCodeAdTooLarge = 16
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                  Internal error. DeclarationSwift case codeInternal = 17Objective-C GADPresentationErrorCodeInternal = 17
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                  Ad has already been used. DeclarationSwift case codeAdAlreadyUsed = 18Objective-C GADPresentationErrorCodeAdAlreadyUsed = 18
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                  Attempted to present ad from a non-main thread. DeclarationSwift case notMainThread = 21Objective-C GADPresentationErrorNotMainThread = 21
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                  A mediation ad network adapter failed to present the ad. The adapter’s error is included as an underlyingError. DeclarationSwift case mediation = 22Objective-C GADPresentationErrorMediation = 22