function toHtml()
    {
        $e = $this->e;

        try {
            $renderer = new RendererPhp();
            return $renderer->capture(
                __DIR__ . '/../.error.page.php'
                , array('exception' => $e)
            );
        } catch(\Exception $ve) {
            ## throw exception if can't render template
            throw $e;
        }
    }