Been having my first crack at Core Data and I\'m getting the following error when running my code on my device, but it works fine on the simulator..
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On my side the problem was that I'd changed the case of a couple of characters in the database name.
When starting a new project, Xcode automatically sets everything up from the project name. If you started out calling your project "Rugbyontv" and later decided to change to "RugbyOnTV" and did a search and replace, that would break it. (Credit to Rob for pointing out that the name is case-sensitive)