How to use UIPopoverController to edit a UIlabel - uilabel

Question

Ive created a UIPopover Controller in my view controller which opens a popup that contains a list of items in it. Im wanting it so that if I choose an item in the list a label on the main view is updated to show this selection. Ive tried using the code below so far but when I click on an item on the list I get the following error: -[ASHAppDelegate portfolioLabel]: unrecognized selector sent to instance 0x6e4fe80
The code Ive used for the UIPopOverController is shown below:
-(IBAction) portFoliosButtonPress:(id)sender {
if (self.portfolioPopoverController == nil) {
ASHPortfolioViewController *portfoliosTableViewController = [[ASHPortfolioViewController alloc] initWithStyle:UITableViewStylePlain];
//CGSize frame = {portfoliosTableViewController.view.frame.size.width, 200.0};
UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:portfoliosTableViewController];
CGSize frame = {300.0, 230.0};
[popover setPopoverContentSize:frame];
popover.delegate = self;
self.portfolioPopoverController = popover;
//self.contentSizeForViewInPopover.height = CGSizeMake(150.0, 140.0);
}
if ([self.portfolioPopoverController isPopoverVisible]) {
[self.portfolioPopoverController dismissPopoverAnimated:YES];
}
else {
[self.portfolioPopoverController presentPopoverFromBarButtonItem:sender
permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}
self.portfolioLabel.text = #"hi";
}
#pragma mark - Popover lifecycle
//---called when the user clicks outside the popover view---
- (BOOL)popoverControllerShouldDismissPopover:(UIPopoverController *)popoverController {
NSLog(#"popover about to be dismissed");
return YES;
}
//---called when the popover view is dismissed---
- (void)popoverControllerDidDismissPopover:
(UIPopoverController *)popoverController {
NSLog(#"popover dismissed");
}
The code used in my UITableView that the popover controller contains is shown below:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
ASHFirstViewController *appDelegate =(ASHFirstViewController *)[[UIApplication sharedApplication] delegate];
appDelegate.portfolioLabel.text = #"Test";
}
'portfolioLabel' is an IBOutlet UIlabel I have in my view controller.