reason: ‘Invalid content size ‘ADBannerContentSizeLandscape’ passed to ADAdSizeForBannerContentSize’
The problem comes from version incompatibilities. The identifier ADBannerContentSizeLandscape works only for version 4.2. If you have declared the AdBannerView inside a xib, this identifier will crash your aplication when running in a 4.0 or 4.1 iOS iPhone.
To solve this problem follow the steps described in: http://www.raywenderlich.com/1371/how-to-integrate-iad-into-your-iphone-app