         self.present(alert, animated: true, completion: nil)
     }
 
-    private func presentDescriptorErrorAlert(_ error: NSError)
+    private func presentDescriptorErrorAlert(with error: NSError)
     {
         let alert = UIAlertController(title: "Descriptor Error", message: error.localizedDescription, preferredStyle: UIAlertControllerStyle.alert)
         alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.default, handler: { [weak self] (action) -> Void in

        }
        else if let error = operation?.error
        {
            self.presentOperationErrorAlert(error)
        }
        else
        {

    
    // MARK: UI Presentation
    
    private func presentOperationErrorAlert(with error: NSError)
    {
        let alert = UIAlertController(title: "Operation Error", message: error.localizedDescription, preferredStyle: UIAlertControllerStyle.alert)
        alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.default, handler: { [weak self] (action) -> Void in
