从库中选择视频但不能选择Swift

Question

我正在尝试允许用户将视频上传到该个人资料。用户可以从手机中选择视频，但在点击视频的选择按钮后，应用程序崩溃并出现致命错误：在展开“可选”值时意外发现nil （LLDB）。

这是我的代码：

var objMoviePlayerController: MPMoviePlayerController = MPMoviePlayerController()
var urlVideo :NSURL = NSURL()

@IBOutlet weak var videoprofileView: UIImageView!
@IBOutlet weak var addvideoBtn: UIButton!

    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject])
{
    urlVideo = (info as NSDictionary).objectForKey(UIImagePickerControllerOriginalImage) as! NSURL
    self.dismissViewControllerAnimated(true, completion: nil)

    objMoviePlayerController = MPMoviePlayerController(contentURL: urlVideo)
    objMoviePlayerController.movieSourceType = MPMovieSourceType.Unknown
    objMoviePlayerController.view.frame = self.videoprofileView.bounds
    objMoviePlayerController.scalingMode = MPMovieScalingMode.AspectFill
    objMoviePlayerController.controlStyle = MPMovieControlStyle.Embedded
    objMoviePlayerController.shouldAutoplay = true

    videoprofileView.addSubview(objMoviePlayerController.view)

    objMoviePlayerController.prepareToPlay()
    objMoviePlayerController.play()
}

我从这行代码收到一个帖子1 exc_bad_instruction（code = exc_i386_invop subcode = 0x0）错误：

urlVideo = (info as NSDictionary).objectForKey(UIImagePickerControllerOriginalImage) as! NSURL

有人可以帮忙吗？ 谢谢！