cakephp error handaling problem

I am using cakephp, I working on Error Handling

I have follow http://book.cakephp.org/1.3/en/view/1188/Error-Handling

I have create AppError My code is

app/app_error.php

<?php

    class AppError extends ErrorHandler {


        function error404() {
            //$this->controller->set('file', $params['file']);
            $this->_outputMessage('error404');
        }

    }
    ?>

I am calling this error404 from my controller

function userprofile($id = null) {
        $user = $this->Session->read('user');
        if($id != $user['User']['id'])
        {
            $this->cakeError('error404');
        }
}

but I found Erro Fatal error: Call to undefined method UsersController::cakeError() in D:\wamp\www\survey\app\Controller\UsersController.php on line 318

I miss some thing?

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