A search on the title of this post reveals that it's pretty common; indeed, I've gotten this error from Xcode. But I can't seem to find any fixes. I'm seeing it now when I run my program, and it ap...

I would like to create an app that uses Swift CoreData 'Documents' which work in the standard macOS fashion [custom extension, a single 'file'/filewrapper containing all data relating to that do...

I'm trying to do a lightweight migration of a SQLite store in Core Data. Working on Lion 10.7.3 with Xcode 4.3.1. In my NSPersistentDocument subclass (AccountDocument), I've overridden the method ...

I am working an iPhone app and a Mac app that use Core Data. I would like to have these 2 apps synchronise their databases via iCloud storage. I have made adjustments to the implementations of th...

I've run into this problem twice now: Xcode 4.1, Lion, and a NSPersistentDocument Core Data project. My program was running fine until I added two "binary data" attributes to one of the entities i...

I have an Mac Application using a NSPersistentDocument. I want to get notified when Objects are deleted to save this information using Core Data. So I'm listening for NSManagedObjectContextObjectsD...