find all users from another table

hi guys,... can anyone help please,... 

I have a PhotoLike table where I have user_id field . I'll like to find all users from User table in PhotoLike (list) 

I got 2 users like photo,... I got a list array from PhotoLike which is fine: 

Array

(

    [59] => 59

    [48] => 48

)

next I want to find ALL users in User.id from PhotoLike.user_id 

I'm getting this error finding users: 

Undefined index:  PhotoLike [APP/controllers/photos_controller.php, line 1161] 

this is my photos_controller.php 

  function likes($id = null)

  {

      if(!($photo = $this->Photo->findById($id)))

      {

        $this->flash('error', ucfirst(i18n::translate('photo not found')));

        $this->redirect('/not_found');

      }

      $this->set('photo_likes', $photo_likes = $this->PhotoLike->find('list', array('conditions' => array('PhotoLike.photo_id' => $photo['Photo']['id']), 'order' => array('PhotoLike.created' => 'DESC'))));

      debug($photo_likes);

      $this->set('photo_like_users', $photo_like_users = $this->User->find('all', array('conditions' => array('User.id' => $photo_likes['PhotoLike']['user_id']) )));

      debug($photo_like_users);

  }

thanks in advance 

chris 

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