iPhone: Core Data saving error - iphone

Question

I am getting the following error when trying to save an object into my core data model:
2010-09-01 22:07:50.569 Score Card[26566:207] *** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-1262.60.3/UITableView.m:904
2010-09-01 22:07:50.570 Score Card[26566:207] Serious application error. Exception was caught during Core Data change processing. This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification. Invalid update: invalid number of sections. The number of sections contained in the table view after the update (1) must be equal to the number of sections contained in the table view before the update (1), plus or minus the number of sections inserted or deleted (1 inserted, 0 deleted). with userInfo (null)
Detected an attempt to call a symbol in system libraries that is not present on the iPhone:
_Unwind_Resume called from function -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] in image CoreData.
2010-09-01 22:07:50.572 Score Card[26566:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of sections. The number of sections contained in the table view after the update (1) must be equal to the number of sections contained in the table view before the update (1), plus or minus the number of sections inserted or deleted (1 inserted, 0 deleted).'
*** Call stack at first throw:
(
0 CoreFoundation 0x02661b99 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x027b140e objc_exception_throw + 47
2 CoreFoundation 0x0261a238 +[NSException raise:format:arguments:] + 136
3 Foundation 0x000bae37 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 116
4 UIKit 0x0033a9a6 -[UITableView(_UITableViewPrivate) _endCellAnimationsWithContext:] + 7806
5 UIKit 0x0032a75b -[UITableView insertSections:withRowAnimation:] + 56
6 Score Card 0x00003918 -[History controller:didChangeSection:atIndex:forChangeType:] + 133
7 CoreData 0x0246db81 -[NSFetchedResultsController(PrivateMethods) _managedObjectContextDidChange:] + 2177
8 Foundation 0x0002a0e1 _nsnote_callback + 145
9 CoreFoundation 0x02639f29 __CFXNotificationPost_old + 745
10 CoreFoundation 0x025b926a _CFXNotificationPostNotification + 186
11 Foundation 0x0001fc8a -[NSNotificationCenter postNotificationName:object:userInfo:] + 134
12 CoreData 0x023a8879 -[NSManagedObjectContext(_NSInternalNotificationHandling) _postObjectsDidChangeNotificationWithUserInfo:] + 89
13 CoreData 0x02418193 -[NSManagedObjectContext(_NSInternalChangeProcessing) _createAndPostChangeNotification:withDeletions:withUpdates:withRefreshes:] + 259
14 CoreData 0x0238b208 -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] + 1352
15 CoreData 0x023c4e55 -[NSManagedObjectContext save:] + 149
16 Score Card 0x000053ad -[TimeRun saveAction] + 65
17 Score Card 0x00004116 -[TimeRun countDown] + 326
18 Foundation 0x000561c9 __NSFireTimer + 125
19 CoreFoundation 0x02642f73 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 19
20 CoreFoundation 0x026445b4 __CFRunLoopDoTimer + 1364
21 CoreFoundation 0x025a0dd9 __CFRunLoopRun + 1817
22 CoreFoundation 0x025a0350 CFRunLoopRunSpecific + 208
23 CoreFoundation 0x025a0271 CFRunLoopRunInMode + 97
24 GraphicsServices 0x02f4000c GSEventRunModal + 217
25 GraphicsServices 0x02f400d1 GSEventRun + 115
26 UIKit 0x002ceaf2 UIApplicationMain + 1160
27 Score Card 0x00002998 main + 102
28 Score Card 0x00002929 start + 53
)
terminate called after throwing an instance of 'NSException
I am just not sure how to fix the issue. I am not inserting any sections, so I am at a loss here. Ideas?
EDIT:
Does it have to do with how I am fetching my results? It seems I am using a key for section name, but I don't want sections:
- (NSFetchedResultsController *)fetchedResultsController {
if (fetchedResultsController != nil) {
return fetchedResultsController;
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Mission" inManagedObjectContext:managedObjectContext];
[fetchRequest setEntity:entity];
// Create the sort descriptors array.
NSSortDescriptor *startDescriptor = [[NSSortDescriptor alloc] initWithKey:#"title" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:startDescriptor, nil];
[fetchRequest setSortDescriptors:sortDescriptors];
// Create and initialize the fetch results controller.
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:managedObjectContext sectionNameKeyPath:#"title" cacheName:#"Root"];
self.fetchedResultsController = aFetchedResultsController;
self.fetchedResultsController.delegate = self;
// Memory management.
[aFetchedResultsController release];
[fetchRequest release];
[startDescriptor release];
[sortDescriptors release];
return fetchedResultsController;
}//end

Answer 1

If you still want a section name.The following code works:
- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
atIndex:(NSUInteger)sectionIndex
forChangeType:(NSFetchedResultsChangeType)type{
switch(type)
{
case NSFetchedResultsChangeInsert:
[self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeDelete:
[self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
break;
default:
break;
}
}

Answer 2

This tells you your problem:
Invalid update: invalid number of
sections. The number of sections
contained in the table view after the
update (1) must be equal to the number
of sections contained in the table
view before the update (1), plus or
minus the number of sections inserted
or deleted (1 inserted, 0 deleted).
After the update, you are returning the incorrect number of sections from 'numberOfSectionsInTableView:`. Most likely, something in update changes the sections but you keep returning the old section number count.

Answer 3

Setting sectionNameKeyPath: to nil has fixed my issue.

Answer 4

they say you delete the app in your simulator then "Clean all build targets" then rebuild and run again. Hope this helps
I based my answer on: 'NSInternalInconsistencyException'