Core Data executeFetchRequest throws NSGenericException (Collection was mutated while being enumerated)

Question

I\'m developing a iPhone app with Core Data. All user data should be synchronized with our servers. For this purpose I created a subclass of NSOperation witch loads new data fro

Answer 1

I had the same problem... It was solved because I was using the managedObjectContext that was created on the main thread on a background thread. The solution was to create a different ManagedObjectContext on the background thread, and use the regular persistentStoreCoordinator... it worked fine after that!