TwillErrorView method in twill exceptioHandler

[devXbian]

HI,
I was trying to use the method named getTwillErrorView available in twill exceptionHandler. I overrided the handler with my handler and found that there's a bug in the file viewFactory is being instantiated as responsefactory in constructor and hance throwing error of '_

exists method doesnot exist in ResponseFactory class

_'.
Here is the constructor of twill handler :

public function __construct(
Container $container,
Redirector $redirector,
UrlGenerator $urlGenerator,
ResponseFactory $responseFactory,
Config $config,
ViewFactory $viewFactory
) {
parent::__construct($container);

    $this->redirector = $redirector;
    $this->urlGenerator = $urlGenerator;
    $this->responseFactory = $responseFactory;
    $this->viewFactory = $responseFactory;
    $this->config = $config;
}

Also i want to confirm if there's any other way to utilize other than overriding as what's the use of providing that method if its not being used or invoked anywhere in twill.

Any help would be appreciated.