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:
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NSDictionary *options = @{NSSQLitePragmasOption: @{@"journal_mode": @"delete"}, NSMigratePersistentStoresAutomaticallyOption:@YES, NSInferMappingModelAutomaticallyOption:@YES}; NSError *error = nil; _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error] { // oh dear... } |
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.