GA_System has exited with status -1.

#0  0x907c6ba4 in CFRetain
#1  0x929fc724 in _NSKeyValueObservationInfoCreateByRemoving
#2  0x929fc4fc in -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:]
#3  0x929fc3ec in -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:]
#4  0x93974d38 in -[_NSModelObservingTracker _registerOrUnregister:observerNotificationsForModelObject:]
#5  0x9396c7b8 in -[_NSModelObservingTracker clearAllModelObjectObserving]
#6  0x9396c664 in -[_NSModelObservingTracker setIndexReferenceModelObjectArray:clearAllModelObjectObserving:]
#7  0x9396e95c in -[NSTableBinder _updateContent]
#8  0x9396e7e0 in -[NSTableBinder _observeValueForKeyPath:ofObject:context:]
#9  0x9396e5c4 in -[NSTableBinder observeValueForKeyPath:ofObject:change:context:]
#10 0x929fcd08 in -[NSObject(NSKeyValueObservingPrivate) _notifyObserversForKeyPath:change:]
#11 0x93972608 in -[NSController _notifyObserversForKeyPath:change:]
#12 0x93972420 in -[NSArrayController didChangeValuesForArrangedKeys:objectKeys:indexKeys:]
#13 0x93971b24 in -[NSArrayController setContent:]
#14 0x93bfee98 in -[_NSManagedProxy _managedObjectsChangedInContext:]
#15 0x92975ad8 in _nsnote_callback
#16 0x9080b4c4 in blogCFXNotificationPost
#17 0x908035a0 in _CFXNotificationPostNotification
#18 0x9295fee0 in -[NSNotificationCenter postNotificationName:object:userInfo:]
#19 0x940e22cc in -[NSManagedObjectContext(_NSInternalNotificationHandling) _postObjectsDidChangeNotificationWithUserInfo:]
#20 0x940e2244 in -[NSManagedObjectContext(_NSInternalChangeProcessing) _createAndPostChangeNotification:withDeletions:withUpdates:withRefreshes:]
#21 0x940e16e8 in -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:]
#22 0x940e2a60 in -[NSManagedObjectContext executeFetchRequest:error:]
#23 0x0003daf8 in -[GAThreadController prefForKey:] at GAThreadController.m:290
#24 0x0003e230 in -[GAThreadController selectObjectThroughTourney:] at GAThreadController.m:360
#25 0x0003c668 in -[GAThreadController runSystem] at GAThreadController.m:154
#26 0x0003b60c in +[GAThreadController runSystemWithGlob:] at GAThreadController.m:43
#27 0x92976194 in forkThreadForFunction
#28 0x9002ba68 in _pthread_body