Xcode 8 beta 6 error: Attempt to serialize store access on non-owning coordinator

Question

Anyone getting the following error with Xcode 8 beta 6: Attempt to serialize store access on non-owning coordinator? Any advice how to eliminate it would be greatly appreciated.

Answer 1

I saw the same error on performing performFetch on iOS 10.0.1:

- (void) refreshFetchedResults:(NSFetchedResultsController *)controller {

    [self configureFetchRequest:controller.fetchRequest];

        NSError *error = nil;
        if (![controller performFetch:&error]) {
            DDLogError(@"Unresolved error %@, %@", error, [error userInfo]);
        }
    }
}

As reported here, performing a save on the managedObjectContext associated with the NSFetchedResultsController before executing performFetch stops the warning from appearing. (In my case, there were changes to be saved.)