Problem with Scaffold

Hi,

I have Scaffold a table and when I try to edit a result, I'm getting this message :

Cannot resolve attribute "Id' in the model

The thing is that I don't have any column named "Id". Here's my model class :

<?php

class User extends \Phalcon\Mvc\Model {

/**
 *
 * @var integer
 */
public $UserID;

/**
 *
 * @var string
 */
public $Email;

/**
 *
 * @var string
 */
public $Firstname;

/**
 *
 * @var string
 */
public $Lastname;

/**
 *
 * @var integer
 */
public $IsBlocked;

/**
 *
 * @var string
 */
public $Password;

/**
 *
 * @var string
 */
public $Type;

/**
 * Initialize method for model.
 */
public function initialize() {

    $this->setSource('User');

    $this->hasMany("UserID", "UserRole", "UserID");   
    $this->hasMany("UserID", "UserModule", "UserID");
}

/**
 * Independent Column Mapping.
 */
public function columnMap() {

    return array(

        'UserID' => 'UserID', 
        'Email' => 'Email', 
        'Firstname' => 'Firstname', 
        'Lastname' => 'Lastname', 
        'IsBlocked' => 'IsBlocked', 
        'Password' => 'Password', 
        'Type' => 'Type'
    );
}

}

Is there something I'm doing wrong here ? The model have been generated before the scaffold.

thank you.

Daniel