What is Cocoa error 134140

This error can happen if you have several Core Data Model Versions and no Mapping Model. In a nutshell Core Data is telling you that it cannot infer your changes automatically when you add these options to the NSPersistentStoreCoordinator:

If you get this error you need to provide a Core Data Mapping Model. Note that in Xocde 4.x said file must for heavens sake not be in a group or subfolder, otherwise the universe as we know it will seize to exist.

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