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POCoreData: error: Serious application error. Exception was caught during Core Data change processing
 

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  1. POCoreData: error: Serious application error. Exception was caught during Core Data change processing
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    <p>I am running into major issues developing my iphone app. </p> <p>here is the full error:</p> <pre><code>CoreData: error: Serious application error. Exception was caught during Core Data change processing. This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification. -[TimeSpentStudying coordinate]: unrecognized selector sent to instance 0x21db92d0 with userInfo (null) </code></pre> <p>This is weird because I have two coreData entities ( Locations &amp; TimeSpentStudying). But I dont think those are the problems. <code>[TimeSpentStudying coordinate]</code> is weird, because I do not have a <code>coordinate</code> property sent on <code>TimeSpentStudying</code> core data class</p> <p>I have a mapView set up, and when a user taps on the detail disclosure button on an mkannotationview, a new view (LibraryTrackTimeViewController) pops up, but is pretty much unusable. I tried calling NSLog in viewDidLoad and nothing showed up.</p> <p>mapViewController.m</p> <pre><code>#pragma mark - NSNotification - (void)contextDidChange:(NSNotification *)notification { if ([self isViewLoaded]) { [self updateLocations]; } </code></pre> <p>.</p> <pre><code>- (void)updateLocations { NSEntityDescription *entity = [NSEntityDescription entityForName:@"Location" inManagedObjectContext:self.managedObjectContext]; NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; [fetchRequest setEntity:entity]; NSError *error; NSArray * foundObjects = [self.managedObjectContext executeFetchRequest:fetchRequest error:&amp;error]; if (foundObjects == nil) { FATAL_CORE_DATA_ERROR(error); return; } if (locations != nil) { [self.mapView removeAnnotations:locations]; } locations = foundObjects; [self.mapView addAnnotations:locations]; </code></pre> <p>}</p> <pre><code>-(void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self name:NSManagedObjectContextObjectsDidChangeNotification object:self.managedObjectContext]; } </code></pre> <p>the error I think might have to do with the prepareForSegue method in mapViewController.m</p> <pre><code>-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if (distance &lt; 500) { if ([segue.identifier isEqualToString:@"TrackLibraryTimes"]) { UINavigationController *navigationController = segue.destinationViewController; LibraryTrackTimeViewController *controller = (LibraryTrackTimeViewController *)navigationController.topViewController; controller.managedObjectContext = self.managedObjectContext; } }} </code></pre> <p>I apologize for the rough syntax, I am just getting used to SO, if you need any more code, please let me know, thanks all.</p>
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    1. COHi and welcome! Also, great question!
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    2. COThe error message clearly states that the `coordinate` message is sent to an instance of `TimeSpentStudying`, probably the object with address 0x21db92d0. So at some point you are working with a `TimeSpentStudying` object where a different type (`Locations`?) is expected. Due to the dynamic method resolution in Objective-C, such problems are often revealed only at runtime. You should try to locate the problem, e.g. by setting a breakpoint on all Objective-C exceptions.
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