Problem with objective-c troubleShooting

Hi there,
i'm all new to mac & iOS developement and am getting startet by working throught what appeared to be a great book "Einstieg in Objective-C 2.0 and Cocoa inkl iPhone programming".

what im doing right now is creating an Weblog App for the iPhone by following stepBy step coding and interface instructions by this book.

problem: everything seems to work just fine, i can compile and everything. but one funktion does not work which is creating a new article.

the errorcode looks like that:

+2011-01-25 14:59:28.775 WeblogClientTouch[12682:207] Fehler beim Anlegen eines neuen Artikels+

and is produced by an NSLog:

if (![managedObjectContext save:&error]) {
NSLog(@"Fehler beim Anlegen eines neuen Artikels");
}

so apparently the saving of a new entity 'article' does not work. here some code snippets that might help, first the function that creates a new article in which the error occurs:

- (IBAction)neuerArtikel
{
 //erzeuge artikel
 NSEntityDescription *artikelDescription = [[fetchedResultsController fetchRequest]entity];
 NSManagedObject *newArtikel = [NSEntityDescription insertNewObjectForEntityForName:[artikelDescription name] 
 inManagedObjectContext:managedObjectContext];
 
 //befülle artikel mit standardwerten
 [newArtikel setValue:NSLocalizedString(@"Neuer Artikel", nil) 
 forKey:@"titel"];
 [newArtikel setValue:[NSDate date] forKey:@"datum"];
 [newArtikel setValue:@"Markus" forKey:@"autor"];
 
 //speichere artikel
 NSError *error;
 
 if (![managedObjectContext save:&error]) {
 NSLog(@"Fehler beim Anlegen eines neuen Artikels");
 }
 
 //Tableview aktualisieren
 [self.tableView reloadData];
}

in my datamodel i have only one entity named "Artikel" with the attributes: autor, titel, datum, inhalt.


i would be very glad about some tips, because i've been trying to solve the problem for nearly 3 hours now and i dont think it can be that tricky..

Message was edited by: sfluecki

Message was edited by: sfluecki