ios - ABPersonViewController を表示するこのコードの何が問題になっていますか?

Question

-(void) vDisplayPerson:(ABRecordRef)person
{
    ABPersonViewController *picker = [[ABPersonViewController alloc] init] ;
    picker.personViewDelegate = self;
    picker.displayedPerson = person;
    picker.displayedProperties=@[@(kABPersonPhoneProperty),@(kABPersonEmailProperty),@(kABPersonBirthdayProperty),@(kABPersonOrganizationProperty),@(kABPersonJobTitleProperty),@(kABPersonDepartmentProperty),@(kABPersonNoteProperty),@(kABPersonCreationDateProperty)];
    // Allow users to edit the person’s information
    picker.allowsEditing = YES;
    picker.allowsActions=YES;
    //[picker setValue:[NSNumber numberWithBool:YES] forKey:@"allowsDeletion"];
    [self.navigationController pushViewController:picker animated:YES];

}

[self.navigationController pushViewController:picker animation:YES] の後。

私は得た

2013-10-08 09:29:37.499 Recent Contact[5804:a0b] *** Assertion failure in +[CNContact propertyForPropertyID:], /SourceCache/AddressBookUI_Sim/AddressBookUI-1553/Framework/Sources/CNUIContact/CNContact.m:855

CNContact がどのクラスなのか、なぜ間違っているのかさえわかりません。