UIImageWriteToSavedPhotosAlbum does not work in iOS 6 iPad 3
I was able to save to the Camera Roll but when I upgraded to iOS 6 it stops working. It turns out my app needs (but does not have, this is new in iOS 6) permission to access the camera roll. To obtain permission, go to Settings -> Privacy -> Photos. I am able to save to the camera roll with UIImageWriteToSavedPhotosAlbum()again.
The image is being written to the Camera Roll album. When used on an iOS device without a camera, this method adds the image to the Saved Photos album rather than to the Camera Roll album. (UIKit Function Reference)
Looks like there are no Camera Roll or Saved Photos albums on your iPad and UIImageWriteToSavedPhotosAlbum() can't find the matching album to save photo.
Launch Photos app as it mentioned in error recovery suggestion: NSLocalizedRecoverySuggestion=Launch the Photos application
and then try to take photo via Camera app.