ADBannerView crashes internally with _sanitizeAndForwardErrorToDelegate: > doesNotRecognizeSelector

AdBannerView crashes with _sanitizeAndForwardErrorToDelegate . is this some internal crash?

i went through 3 of these questions in stack overflow. none have answers . can someone give some hints if you guys faced this?

i am开发者_运维技巧 setting delegate to nil before releasing .

some previous crashes similar posted in stackoverflow issues:

Strange iAd Errors with iOS 4.3.3

https://stackoverflow.com/questions/3598376/iphone-iad-error

iAd error how to resolve it?

none have helpful ansers. how to know what is causing crash here?