         
         self.view.backgroundColor = UIColor.whiteColor()
         
-        self.cancelButton = UIBarButtonItem(barButtonSystemItem: .Cancel, target: self, action: "cancel:")
+        self.cancelButton = UIBarButtonItem(barButtonSystemItem: .Cancel, target: self, action: #selector(DropboxConnectController.cancel(_:)))
         self.navigationItem.rightBarButtonItem = self.cancelButton
     }
     

        return decisionHandler(.Allow)
    }
    
    public func webView(webView: WKWebView!, didFinishNavigation navigation: WKNavigation!) {
        indicator.stopAnimating()
        indicator.removeFromSuperview()
    }

    }
    
    func showHideBackButton(show: Bool) {
        navigationItem.leftBarButtonItem = show ? UIBarButtonItem(barButtonSystemItem: .Rewind, target: self, action: #selector(DropboxConnectController.goBack(_:))) : nil
    }
    
    func goBack(sender: AnyObject?) {
