Missing Method in NewsletterController

You are seeing this error because the action index is not defined in controller NewsletterController

If you want to customize this error message, create app/views/errors/missing_action.thtml.

Fatal: Confirm you have created the NewsletterController::index() in file : app/controllers/newsletter_controller.php

<?php
class NewsletterController extends AppController {
   function index() {
   }
}
?>