iOS5 iPad UIPopoverController initWithContentViewController NSGenericException

import UIKit

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let popoverController = UIPopoverController(contentViewController: DetailViewController())
        popoverController.popoverContentSize = CGSize(width: 300, height: 400)
        popoverController.presentPopoverFromRect(CGRect(x: 100, y: 100, width: 100, height: 100), inView: self.view, permittedArrowDirections: .Any, animated: true)
    }
    
}

class DetailViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.backgroundColor = .red
    }
}