Not Found Functionality

In my app I need to implement a functionality where in if the controller name and/or action name in the URL are wrong (i.e. misspelled and hence not found) or missing altogether then I should be able to show a custom 404 page.

For ex:

CORRECT: https://my-app/correct-controller-name/correct-action-name

WRONG: https://my-app/wrong-controller-name/wrong-action-name : I should be able to show custom 404 page.

WRONG: https://my-app/correct-controller-name/ : Here action name is missing altogether and I should be able to show a custom 404 page.

I have tried various permutations and combinations in my code based on the solutions I found on the Web but I am getting an "Phalcon\DI\Exception: Service 'view' was not found in the dependency injection container" error everytime and 404 page is not showing up.

Any help would be greatly appreciated. Thank you.

Code below:

class ControllerBase extends \Phalcon\Mvc\Controller
{

    public $breadcrumb;
    public $show_breadcrumb = 1;

    public function indexAction()
    {
        $id = (int)$this->getId($param);
        if ($id > 0) {

           // do you stuff
        } else {
           $this->dispatcher->forward(array(
               'controller' => 'error', 'action' =>   'show404')
           );
        }
    }
}

---------------------------------------
//Set 404 paths
$router->notFound(array(
    "controller" => "error",
    "action" => "show404"
));

/**
 * Backend routes
 */
//echo "<pre>";print_r($router);
return $router;
---------------------------------------
class ErrorController extends \Phalcon\Mvc\Controller
{
     public function initialize()
        {
           global $config;  
           $this->config = $config;
         }

    public function indexAction()
    {
            echo 'Sorry';exit;
    }

        public function show404Action()
    {

            $this->view->setLayout("forms");
            Tag::setTitle('404');
            $this->view->setVar("config", $this->config);
    }
}
------------------------------------------
$di->set(
    'dispatcher',
    function() use ($di) {
        $eventsManager = $di->getShared('eventsManager');
        $eventsManager->attach(
            'dispatch:beforeException',
            function($event, $dispatcher, $exception) {
                switch ($exception->getCode()) {
                    case Dispatcher::EXCEPTION_HANDLER_NOT_FOUND:
                    case Dispatcher::EXCEPTION_ACTION_NOT_FOUND:
                        $dispatcher->forward(
                            array(
                                'controller' => 'error',
                                'action' => 'show404',
                            )
                        );

                        return false;
                        break; // for checkstyle
                    default:
                        $dispatcher->forward(
                            array(
                                'controller' => 'error',
                                'action' => 'uncaughtException',
                            )
                        );
                        return false;
                        break; // for checkstyle
                }

                //if ($exception instanceof \Phalcon\Mvc\Dispatcher\Exception) {
                /*if ($exception) {
                    $dispatcher->forward(
                        array(
                            'controller' => 'error',
                            'action' => 'show404',
                        )
                    );

                    return false;                    
                }*/
            }
        );
        $dispatcher = new Dispatcher();
        $dispatcher->setEventsManager($eventsManager);
        return $dispatcher;
    },
    true
);