iAds are not showing in my iphone app

Question

Previous iads were displaying now I am getting this error:

iAd error: Error Domain=ADErrorDomain Code=0 "The operation couldn’t be completed. Unknown error" UserInfo=0xbbc3c10 {ADInternalErrorCode=0, ADInternalErrorDomain=ADErrorDomain, NSLocalizedFailureReason=Unknown error}

Answer 1

Go to settings in your iPhone to a section called Developer. Than under the iAd Developer App Testing section go to fill rate and check if the rate is 0% which will give you an error.