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iOS Build a Playlist Browser with Swift Building the Music Library and Playlist Models Struct Initialization

Swift CompilerError

'AnyObject?' is not convertible to 'String!'; did you mean to use 'as!' to force downcast? I'm a little stuck gives me this error and I do not know what to do here is the code:

import Foundation import UIKit

struct Playlist {

var title: String?
var description: String?
var icon: UIImage?
var largeIcon: UIImage?
var artists: [String] = []
var backgroundColor: UIColor = UIColor.clearColor()

init(index:Int) {
    let musicLibary = MusicLibrary().library
    let playlistDictionary = musicLibary[index]

    title = playlistDictionary["itle"] as String!
    description = playlistDictionary["decription"] as String!

    let iconName = playlistDictionary["icon"] as String!
    icon = UIImage(named: iconName!)


    let largeIconName = playlistDictionary["largeIcon"] as String!
    largeIcon = UIImage(named: largeIconName)

    artists += playlistDictionary["artists"] as [String]





}

} PLZ HELP!