So I keep getting an error can someone help?

@IBOutlet weak var playlistImageView0: UIImageView!
@IBOutlet weak var Button: UIButton!


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.


    //crashes and highlights in green here 
    let playlist = Playlist(index: 0)
    playlistImageView0.image = playlist.icon

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.

}



override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showPlayListDetailSegue" {
        let playlistDetailControler = segue.destinationViewController as! PlaylistDetailViewController

        playlistDetailControler.playlist = Playlist(index: 0)
    }
}

@IBAction func showPlaylistDetail(sender: AnyObject) {
        performSegueWithIdentifier("showPlayListDetailSegue", sender: sender)
}

@IBOutlet weak var playlistCoverImage: UIImageView!
@IBOutlet weak var playlistTitle: UILabel!
@IBOutlet weak var playlistDescirption: UILabel!

@IBOutlet weak var playlistArtist0: UILabel!
@IBOutlet weak var playlistArtist1: UILabel!
@IBOutlet weak var playlistArtist2: UILabel!

var playlist: Playlist?


override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.

    if playlist != nil {

        playlistCoverImage.image = playlist!.largeIcon
        playlistCoverImage.backgroundColor = playlist!.backgroundColor
        playlistTitle.text = playlist!.title
        playlistDescirption.text = playlist!.description

        playlistArtist0.text = playlist!.artist[0]
        playlistArtist1.text = playlist!.artist[1]
        playlistArtist2.text = playlist!.artist[2]

    }


}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}