Swift Versión 3
Xcode versión 8.3.3 (8E3004b)

Esta pregunta ya se hizo y respondió antes. Sin embargo, no puedo encontrar una manera de corregir este error. @ "Crear un formato de imagen con un tipo desconocido es un error" con UIImagePickerController

Cuando se selecciona una nueva imagen de la Biblioteca de fotos, aparece este error

Generic Crear un formato de imagen con un tipo desconocido es un error.

Selecciono la foto y cuando toco elegir, recibo un error enfunc takePhoto donde hago esta tareaself?.imgView.image = newImage

error fatal: se encontró inesperadamente nulo al desenvolver un valor opcional Impresión de la descripción de newImage: error producido por la expresión: error: /var/folders/s0/xq_zc7l56m1__n1qjk29p6tw0000gn/T/./lldb/2631/expr1.swift:1:80: error: uso del tipo no declarado 'UIKit' Swift._DebuggerSupport.stringForPrintObject (Swift.UnsafePointer> (bitPattern: 0x118055200) !. pointee) ^ ~~~~

typealias imagePickerHelperCompletion = ((UIImage?) -> Void)!

class ImagePickerHelper: NSObject {

 weak var viewController: UIViewController!
 var cameraFlashMode: UIImagePickerControllerCameraFlashMode   //flash, no flash
 var photoLibraryIsVisible: Bool
 var cameraDevice: UIImagePickerControllerCameraDevice //front, back camera
 var completion: imagePickerHelperCompletion


   init(viewController: UIViewController, cameraFlashMode:UIImagePickerControllerCameraFlashMode, photoLibraryIsVisible: Bool,cameraDevice: UIImagePickerControllerCameraDevice, completion: imagePickerHelperCompletion) {

    self.viewController = viewController
    self.completion = completion
    self.cameraFlashMode = cameraFlashMode
    self.photoLibraryIsVisible = photoLibraryIsVisible
    self.cameraDevice = cameraDevice

    //super.init() implemented by subclasses to initializer a new object (the receiver) immediately after memory has been allocated
    super.init()

    self.showPhotoSourceSelection()
}


//show camera or photo library
func showPhotoSourceSelection() {

    let actionSheet = UIAlertController(title: "Take new photo", message: "Would you like to open \n Camera or Photo Library?", preferredStyle: .actionSheet)

    let cameraAction = UIAlertAction(title: "Camera", style: .default) { (action) in
        self.showImagePicker(sourceType: .camera)
    }

    let photoLibraryAction = UIAlertAction(title: "Photo Library", style: .default) { (action) in
        self.showImagePicker(sourceType: .photoLibrary)
    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action) in  }

        actionSheet.addAction(cameraAction)
    if photoLibraryIsVisible == true { actionSheet.addAction(photoLibraryAction) }
        actionSheet.addAction(cancelAction)
      viewController.present(actionSheet, animated: true, completion: nil)
}



func showImagePicker(sourceType: UIImagePickerControllerSourceType) {

    let imagePicker = UIImagePickerController()
    imagePicker.allowsEditing = true //user can crop the image, or do some editing
    imagePicker.sourceType = sourceType
    imagePicker.mediaTypes = [kUTTypeImage as String]
    imagePicker.delegate = self

      if imagePicker.sourceType == .camera {
         imagePicker.cameraFlashMode = cameraFlashMode
         imagePicker.cameraDevice = self.cameraDevice
    }
    viewController.present(imagePicker, animated: true, completion: nil)
 }
}//end of class



 extension ImagePickerHelper: UIImagePickerControllerDelegate, UINavigationControllerDelegate {

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    viewController.dismiss(animated: true, completion: nil)
}



//if user did take a photo
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    print(info)
  //prints out ["UIImagePickerControllerEditedImage": <UIImage: 0x610000294320> size {746, 498} orientation 0 scale 1.000000, "UIImagePickerControllerMediaType": public.image, "UIImagePickerControllerCropRect": NSRect: {{0, 0}, {2661, 1779}}, "UIImagePickerControllerReferenceURL": assets-library://asset/asset.JPG?id=ED7AC36B-A150-4C38-BB8C-B6D696F4F2ED&ext=JPG, "UIImagePickerControllerOriginalImage": <UIImage: 0x610000299320> size {2668, 1780} orientation 0 scale 1.000000]



    if let image = info[UIImagePickerControllerEditedImage] as? UIImage {
        completion(image)
        viewController.dismiss(animated: true, completion: nil)

    } else if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
          viewController.dismiss(animated: true, completion: nil)
          completion(image)

        } else {
        print("something is wrong line \(#line)")
       }
    }


}//end of extension






class ProfileViewController: UITableViewController {

  var imagePickerHelper: ImagePickerHelper!
  override func viewDidLoad() {
     super.viewDidLoad()
 }

  @IBAction func takePhoto(_ sender: Any) {

     //create instance of ImagePickerHelper and take photo, or get it from photoLibrary
      imagePickerHelper = ImagePickerHelper(  viewController: self, cameraFlashMode: .auto,photoLibraryIsVisible: true, cameraDevice: .front,
        completion: { [weak self] (newImage) in
     })
   }
}//end of class