The UIImagePickerController is getting an Exceptionio error, but I don't know why.

@IBAction functapProfileImage(_sender:Any){
    showAlert()
}



func sourceTypeImagePicker(sourceType:UIImagePickerController.SourceType){

    letcameraPicker=UIImagePickerController()
        cameraPicker.sourceType=sourceType
        cameraPicker.delegate=self
        cameraPicker.allowsEditing=true
        present(cameraPicker, animated:true, completion:nil)

}


funcimagePickerControllerDidCancel(_picker:UIImagePickerController){
    picker.dismiss(animated:true, completion:nil)
}


funcimagePickerController(_picker:UIImagePickerController, didFinishPickingMediaWithInfo:[UIImagePickerController.InfoKey:Any]){

    iflet pickerImage = info [.editedImage] as ?UIImage{
        self.profileImage.image=pickerImage
            picker.dismiss(animated:true, completion:nil)

    }
}


func showAlert(){

    let alertController=UIAlertController(title: "Select", message: "Which do you want to use?" preferredStyle:.actionSheet)

        let action1 = UIAlertAction(title: "Camera", style: .default) {(alert) in

            let sourceType —UIImagePickerController.SourceType=.camera
                self.sourceTypeImagePicker(sourceType:sourceType)

        }
    let action2 = UIAlertAction(title: "Album", style: .default) {(alert) in

        let sourceType —UIImagePickerController.SourceType=.photoLibrary
            self.sourceTypeImagePicker(sourceType:sourceType)

    }

    let action3 = UIAlertAction(title: "Cancel", style: .cancel)


        alertController.addAction(action1)
        alertController.addAction(action2)
        alertController.addAction(action3)
        self.present(alertController, animated:true, completion:nil)

}

class checkPermission{

    init(){

    }

    func checkCamera(){
        PHPhotoLibrary.requestAuthorization {(status) in
            switch(status){


            case.notDetermined:
                print ("notDetermined")
            case.restricted:
                print("restricted")
            case.denied:
                print("denied")
            case.authorized:
                print("authorized")
            case.limited:
                print("limited")
            @unknown default:
                break
            }
        }
    }
}