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error: no 'assign', 'retain', or 'copy' attribute is specified


I am getting this error when remotely compiling for iOS from PC. Any idea what it means?

 In file included from E:\Program Files\Epic Games\UE_4.21\Engine\Intermediate\UnzippedFrameworks\ThirdParty\IOS\Google\GoogleMobileAds.embeddedframework\GoogleMobileAds.framework\Headers\GoogleMobileAds.h:38:
 E:\Program Files\Epic Games\UE_4.21\Engine\Intermediate\UnzippedFrameworks\ThirdParty\IOS\Google\GoogleMobileAds.embeddedframework\GoogleMobileAds.framework\Headers\GADMediaContent.h:21:1: error: no 'assign', 'retain', or 'copy' attribute is specified - 'assign' is assumed [-Werror,-Wobjc-property-no-attribute]
 @property(nonatomic, nullable) UIImage *mainImage;
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asked Mar 04 '19 at 09:29 PM in C++ Programming

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