Creating an image format with an unknown type is an error UIImagePickerController() , unexpectedly found nil - swift3

Question

Swift Version 3
Xcode Version 8.3.3 (8E3004b)
This question has been asked and answered before. Yet, I cannot find a way fix this error.
"Creating an image format with an unknown type is an error" with UIImagePickerController
When a new picture is selected from Photo Library, I get this error
Generic Creating an image format with an unknown type is an error.
I select the photo and when I tap choose, I get error in func takePhoto where I do this assignment self?.imgView.image = newImage
fatal error: unexpectedly found nil while unwrapping an Optional value
Printing description of newImage: expression produced error: error:
/var/folders/s0/xq_zc7l56m1__n1qjk29p6tw0000gn/T/./lldb/2631/expr1.swift:1:80:
error: use of undeclared type '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