Problem s Route::FILTER_IN – Callback is not callable

mam nieco taketo:

<?php
	$frontRouter[] = new Route('[!<lang>]/[!<page [a-z-]+>]', array(
		'presenter' => 'Page',
		'action' => 'show',
		'page' => array(
			Route::FILTER_IN => callback('\\Models\\PageModel::slugToId'),
			Route::FILTER_OUT => callback('PageModel::idToSlug')
		),
		'lang' => 'sk',
	));
?>

a chcem zavolat /app/models/PageModel.php

<?php

namespace Models;

class Page extends Base
{
    public function idToSlug($id)
    {
        return 'clanok';
    }

	public function slugToId($slug)
    {
        return 3;
    }
}
?>

skusal som aj „Models\\PageModel::slugToId“ aj „PageModel::slugToId“ stale to iste…