capture_photo | photo using AVCaptureSession class in Swift language | iOS library

I am trying to take a photo with the camera and save it to the Gallery. This is what I have done so far:

I have this class that captures the image and then saves it in SQLite, but from what I understand, it saves as blob, (I found this code on the internet and reused a part), I wanted to actually save the path and then retrieve it, because the way it is the quality drops a lot.

I have a normal UIViewController that uses AVCapturePhoto in which I create a custom capture controller.

Everything worked properly until I update to Xcode 9 and converted my code to Swift 4 and now when I try to compile I get this compiling-error:

Undefined symbols for architecture x86_64: "__T0So22AVCapturePhotoSettingsC12AVFoundation01_abC16SwiftNativeTypesACWP", referenced from: __T05Union16CameraControllerC18handleCapturePhotoyyF in CameraController.o "__T012AVFoundation39_AVCapturePhotoSettingsSwiftNativeTypesPAAE016availablePreviewc11PixelFormatG0Says6UInt32VGfg", referenced from: __T05Union16CameraControllerC18handleCapturePhotoyyF in CameraController.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

And in the error tray this message is shown:

Apple Mach-O Linker Error Group

Any hint what may be causing this ?

Updated Info

Here's a Xcode 9 print screen of the error-log. Hope it helps on the compiling error solution.

Edit

Just performing some tests -- if I comment the class code, the compile-error goes away.

Is there anything wrong in the following class implementation that I'm missing in Swift 4 ??

I made an app where you use the default camera to take a photo then displays it on the image view.Problem is, image does not show in the image view. Tried many ways but no solution.

mainactivity.java: