I'm getting a Swift Compiler Error when I create the backgroundColor variable after importing the UIKit. Any clues why?

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 musicLibrary = MusicLibrary().library
        let playlistDictionary = musicLibrary[index]

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

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




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

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

        let colorsDictionary = playlistDictionary["backgroundColor"] as [String: CGFloat]
        backgroundColor = rgbColorFromDictionary(colorsDictionary)