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I create an category object and save it: NSManagedObjectContext *managedObjectContext = [[FTAppDelegate sharedAppDelegate] managedObjectContext]; _category = (Category *)[NSEntityDescription insertNewObjectForEntityForName:@"Category" inManagedObjectContext:managedObjectContext]; NSError *error = nil; [managedObjectContext save:&error]; if (error) { NSLog(@"error saving: %@",error); } then edit the name of the category object and save again. _category.name = _nameTextField.text; NSManagedObjectContext *managedObjectContext = [[FTAppDelegate sharedAppDelegate] managedObjectContext]; NSError *error = nil; [managedObjectContext save:&error]; if (error) { NSLog(@"error saving: %@",error); } and get this error: 2013-01-12 17:53:11.862 instacat[7000:907] Unresolved error Error Domain=NSCocoaErrorDomain Code=134030 "The operation couldn’t be completed. (Cocoa error 134030.)" UserInfo=0x2027b300 {NSAffectedObjectsErrorKey=( "<Category: 0x1ed43cf0> (entity: Category; id: 0x1ed52970 <x-coredata://68E5D7B6-D461-4962-BC07-855349DB3263-7000-00000141BAB4C399/Category/tE8AB2F2E-C14C-4E93-8343-CC245B7726622> ; data: {\n categoryId = nil;\n isPrivate = 0;\n name = techies;\n users = (\n );\n})" ), NSUnderlyingException=Cannot update object that was never inserted.}, { NSAffectedObjectsErrorKey = ( "<Category: 0x1ed43cf0> (entity: Category; id: 0x1ed52970 <x-coredata://68E5D7B6-D461-4962-BC07-855349DB3263-7000-00000141BAB4C399/Category/tE8AB2F2E-C14C-4E93-8343-CC245B7726622> ; data: {\n categoryId = nil;\n isPrivate = 0;\n name = techies;\n users = (\n );\n})" ); NSUnderlyingException = "Cannot update object that was never inserted."; } Thank you for your time a

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