I had the same error, it could be one or more of the following return conflicting orientations:
- Check your -Info.plist, for the key "supported interface orientations"
- Check your Summary pane, by clicking on your app from the project navigator.
- As others have mentioned, check what supportedInterfaceOrientations method is returning.
I solved mine by explicitly defining separate "supported interface orientations (iPad)" and "supported interface orientations (iPhone)" keys in the -Info.plist, as I wanted different orientations for different devices.
Good luck!