call method from another class generating SIGABRT error on xcode - iphone

Question

I am calling a method contained on a controller class that have to change views. It generates an error on insertsubview.view. How to solve it? Thank you
call from current menuViewController class:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
aboutTabController * myObject = [[aboutTabController alloc] init];
if (indexPath.section == 1) {
switch (indexPath.row) {
case 0:
[myObject turnIdioma];
break;
case 1:
//
break;
default:
break;}
}
}
//method implememented in controller class:
- (void) turnIdioma
{
[UIView beginAnimations:#"View Flip" context:nil];
[UIView setAnimationDuration:1.0];
[UIView setAnimationCurve: UIViewAnimationCurveEaseInOut];
if (self.controladorAjustes == nil)
{
settingsViewController *aController = [[settingsViewController alloc] initWithNibName:#"mailViewController" bundle:nil];
self.controladorAjustes = aController;
[aController release];
}
[UIView setAnimationTransition: UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES];
[self.controladorMenu viewWillDisappear:YES];
[self.controladorAjustes viewWillAppear:YES];
[self.controladorMenu.view removeFromSuperview];
[self.view insertSubview:controladorAjustes.view atIndex:0];
[self.controladorMenu viewDidDisappear:YES];
[self.controladorAjustes viewDidAppear:YES];
[UIView commitAnimations];
}

Answer 1

You cannot insert a nil valued object as a subview. Typically the view controller will make sure it is created when you try to get its view property, using the appropriate method depending on whether it is a view defined by a NIB file or not.
IF you are doing something to explicitly set the view to nil then you are probably not taking the right approach. I suspect you are doing something fishy inside your call to:
[self.controladorAjustes viewWillAppear:YES];