SIGABRT Error using NavController in the PopOverController - objective-c

Question

I have posted similar question previously, but this time I am providing some code for analysis. I am creating PopOverController in my AppDelegate.m file and I am adding a NavigationController variable which I want to pass to PopOverController.m file so that using that I want to push other views. Here is how I am creating the PopOver in AppDelegate.m
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
if([viewController isKindOfClass:[SecondViewController class]]){
NSInteger index = [[self tabBarController] selectedIndex];
CGRect buttonFrame = [[[[[self tabBarController] tabBar] subviews] objectAtIndex:index+1] frame];
PopOverViewController *popoverContentController = [[PopOverViewController alloc]init];
UINavigationController *navcon = [[UINavigationController alloc]initWithRootViewController:popoverContentController];
popoverContentController.contentSizeForViewInPopover = CGSizeMake(250, 85);
popover = [[UIPopoverController alloc]initWithContentViewController:popoverContentController];
NSLog(#"X:%f Y:%f",buttonFrame.origin.x,buttonFrame.origin.y);
[popover presentPopoverFromRect:buttonFrame inView:self.tabBarController.tabBar permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];
}
}
And in my PopOverController.m I am trying to use the NavigationController to choose views like this:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
sendFeedback *sendEmailViewController = [[sendFeedback alloc]initWithNibName:#"sendFeedback" bundle:nil];
downLoad *downloadFilelViewController = [[downLoad alloc]initWithNibName:#"downLoad" bundle:nil];
if (indexPath.row == 0)
[self.navigationController pushViewController:sendEmailViewController animated:YES];
else
[self.navigationController pushViewController:downloadFilelViewController animated:YES];
}
But when I click on my TabBar item for the PopOver I am getting this SIGABRT message :
Terminating app due to uncaught exception 'NSGenericException', reason: 'The content view controller argument must be the root of its associated view controller hierarchy.'
Any reason why this is appearing? Is there somewhere I am making a mistake in my code ?

Answer 1

UINavigationController *navcon = [[UINavigationController alloc] initWithRootViewController:popoverContentController];
you are trying to put a popover controller in a navigation controller. I don't think you want this.
To put navigation in popover, you should do this,
UINavigationController *navcon = [[UINavigationController alloc] initWithRootViewController:myViewController];
popoverContentController = [UIPopoverController initWithContentViewController:navcon]
and init the navigation controller with the viewController you want, like TableViewController or something else.