I try to add customer 404 error page, but it is not work. Could you consider to add the customer 404 error page?

here is my code:

application/config/config.php
'components'=>array(
...
'errorHandler'=>array(
'errorAction' => 'site/error'
),
...
),

application/controllers/SiteController.php
public function actionError()
{
$error = Yii::app()->errorHandler->error;

    if( $error )
    {
        $this -> render( 'error', array( 'error' => $error ) );
    }
}

application/views/site/error.php
<div class="errorSummary">

Sorry, it seems like a(n) <?= $error['code']; ?> error has occured during your request.

<p><strong>Message:</strong> <?= $error['message']; ?></p>

</div>

please, move it to feature request