foreach() invalid argument suplied! (Opgelost)

<?php
class categoriesController extends Zend_Controller_Action
{
	
	public function init ()
	{
	
		include ('./application/models/categories.php');
		$this->view->url = $this->_request->getBaseUrl();
		$this->view->stylesPath = $this->view->url . '/public/styles/';
		
	}
	
	public function indexAction ()
	{
	
		$categories = new categories;
	
		$this->view->categories = $categories->fetchAll();
		
		$this->view->paginaTitel = 'Webshop :: Categoriën';
		$this->view->titel = 'Categoriën';
		$this->render();
		
	}
	
}

<?php
class categoriesController extends Zend_Controller_Action
{
 
	public function init ()
	{
 
		include ('./application/models/categories.php');
		$this->view->url = $this->_request->getBaseUrl();
		$this->view->stylesPath = $this->view->url . '/public/styles/';
 
	}
 
	public function indexAction ()
	{
 
		$categories = new categories;
 
		$this->view->categories = $categories->fetchAll();
 
		$this->view->paginaTitel = 'Webshop :: Categoriën';
		$this->view->titel = 'Categoriën';
		$this->render();
 
	}
 
}

<?php
class categories extends Zend_Db_Table
{
	protected $_name = 'webshop_categories';
}

<?php
class categories extends Zend_Db_Table
{
	protected $_name = 'webshop_categories';
}

<?php echo $this->render('header.phtml'); ?>
<?php echo $this->render('menu.phtml'); ?>


<div id="pageContent">
    <h1><?php echo $this->titel; ?></h1>
    <p class="block">
        Welkom op deze webshop.  Maak een keuze uit onderstaande categoriën:<br />
		<br />
<?php foreach ( $this->categories as $categorie ) : ?>
<a href="<?=$this->url ?>id/<?=$categorie->id ?>"><?=$categorie->title ?></a>
<?php endforeach; ?>
    </p>
</div>

<?php echo $this->render('footer.phtml'); ?>

<?php echo $this->render('header.phtml'); ?>
<?php echo $this->render('menu.phtml'); ?>
 
 
<div id="pageContent">
    <h1><?php echo $this->titel; ?></h1>
    <p class="block">
        Welkom op deze webshop.  Maak een keuze uit onderstaande categoriën:<br />
		<br />
<?php foreach ( $this->categories as $categorie ) : ?>
<a href="<?=$this->url ?>id/<?=$categorie->id ?>"><?=$categorie->title ?></a>
<?php endforeach; ?>
    </p>
</div>
 
<?php echo $this->render('footer.phtml'); ?>

<?php
class categories extends Zend_Db_Table_Abstract
{
    protected $_name = 'webshop_categories';
}
?>

<?php
class categories extends Zend_Db_Table_Abstract
{
    protected $_name = 'webshop_categories';
}
?>