Fatal Error: Call to a member function schema() on a non-object

I have some trouble finding a solution for this..

Error: Call to a member function schema() on a non-object  File: /Cake/Model/Model.php  Line: 3627

In my Database there are the tables articles,hashtags and the association articles_hashtags with the foreignkeys article_id and hashtag_id .. So i am trying to get the information what hashtags each article has..

My Article Model

class Article extends AppModel { 
public $hasAndBelongsToMany = array( 
'Hashtag' => array( 
'className' => 'Hashtag', 
'joinTable' => 'articles_hashtags', 
'foreignKey' => 'article_id', 
'associationForeignKey' => 'hashtag_id' 
) ); }

Article Controller

class ArticleController extends AppController { 
public $helpers = array("Html", "Form"); 
public function index() { 
$this->set("posts", $this->Article->find("all")); } }

  

Thanks for your help!!

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