After updating to xCode 6.3 / Swift 1.2 I have run into an error I can't resolve: "Cast from '[SKNode]' to unrelated type 'String' always fails".

Below is my GameScene code which begins by parsing a p-list.

```
import SpriteKit

class GameScene: SKScene, SKPhysicsContactDelegate, NSXMLParserDelegate {

    var currentTMXFile:String?

    override func didMoveToView(view: SKView) {

        /* Parse p-list */

        let path = NSBundle.mainBundle().pathForResource("GameData", ofType: "plist")
        let dict = NSDictionary(contentsOfFile: path!)!
        let playerDict:AnyObject = dict.objectForKey("PlayerSettings")!
        let gameDict:AnyObject = dict.objectForKey("GameSettings")!
        let levelArray:AnyObject = dict.objectForKey("LevelSettings")!

        if let levelNSArray:NSArray = levelArray as? NSArray {

            var levelDict:AnyObject = levelNSArray[level]

            numberOfLevels = levelNSArray.count

            if let tmxFile = levelDict["TMXFile"] as? String {

                currentTMXFile = tmxFile

            }

        }

```

The error is being thrown up at...

```
if let tmxFile = levelDict["TMXFile"] as? String {...

```

and is returning a nil value, even though there is a string value in the p-list and prior to updating, it was working fine. I have tried casting as AnyObject first and this throws up more errors.