AI-generated Key Takeaways
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          IMAAdLoadingErrorData provides data when an ad loading error occurs. 
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          It includes the specific ad error encountered during loading. 
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          It also provides the user context from the original ads request. 
IMAAdLoadingErrorData
@interface IMAAdLoadingErrorData : NSObjectAd error data that is returned when the ads loader fails to load the ad.
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                  The ad error that occurred while loading the ad. DeclarationSwift var adError: IMAAdError { get }Objective-C @property (nonatomic, readonly) IMAAdError *_Nonnull adError;
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                  The user context specified in the ads request. DeclarationSwift var userContext: Any? { get }Objective-C @property (nonatomic, readonly, nullable) id userContext;