Problème model post et user

Bonjour,
Je fais actuellement un site web et je reconcontre cette erreur

Model "Post" is not associated with model "User" [CORE\Cake\Model\Behavior\ContainableBehavior.php, line 342]

Voici mon model post :

<?php 
class Post extends AppModel{

    public $hasMany = array(
        'Media' => array(
            'dependent' => true
            )
        );
    public $belongsTo = array(
        'Category' => array(
            'counterCache' => array('post_count' => array('Post.online'=>1))
            )
        );
    public $recursive = -1;
    public $validate = array(
        'slug' => array(
            'rule' => '/^[a-z0-9\-]+$/',
            'allowEmpty' => true,
            'message' => "L'url n'est pas valide"
        ),
        'name' => array(
            'rule' => 'notBlank',
            'message' => "Vous devez préciser un titre"
        )
    );

    public $order = 'Post.created DESC, Post.id DESC';

    //Permet de generer un brouillon
    public function getDraft($type){
        $post = $this->find('first',array(
            'conditions' => array('online' => -1,'type' => $type)
        ));
        if(empty($post)){
            $this->save(array(
                'type' => $type,
                'online' => -1
            ),false);
            $post = $this->read();

        }
        $post['Post']['online'] = 0;
        return $post;
    }

public function afterFind($data, $primary = false){
        foreach($data as $k=>$d){
            if(isset($d['Post']['slug']) && isset($d['Post']['id']) && isset($d['Post']['type'])){
                $d['Post']['link'] = array(
                    'controller'    => Inflector::pluralize($d['Post']['type']),
                    'action'        => 'show',
                    'id'            => $d['Post']['id'],
                    'slug'          => $d['Post']['slug']
                );
            }
            $data[$k] = $d;
        }
        return $data;
    }

    public function beforeSave($options = array()){
        if(empty($this->data['Post']['slug']) && isset($this->data['Post']['slug']) && !empty($this->data['Post']['name']))
            $this->data['Post']['slug'] = strtolower(Inflector::slug($this->data['Post']['name'],'-'));
        return true;
    }

}

et mon model user :

<?php
class User extends AppModel{

    public $validate = array(
        'username' => array(
            array(
                'rule' => 'alphanumeric',
                'required' => true,
                'allowEmpty' => false,
                'message' => "Votre nom d'utilisateur n'est pas valide"
            ),
            array(
                'rule' => 'isUnique',
                'message' => "Ce nom d'utilisateur est déjà pris"
            )
        ),
        'mail' => array(
            array(
                'rule' => 'email',
                'required' => true,
                'allowEmpty' => false,
                'message' => "Votre email n'est pas valide"
            ),
            array(
                'rule' => 'isUnique',
                'message' => "Cet email est déjà pris"
            )
        ),
        'password' => array(
                'rule' => 'notBlank',
                'message' => "Vous devez entrer un mot de passe",
                'allowEmpty' => false
        )
    );

}

Pouvez-vous m'aider ?

Merci d'avance !