Cakephp Error: An internal error has occurred

I have some code in cakephp which produces an error. Here is the PHP Controller: ``` $this->loadModel( 'Vote' ); //Newly added by amit start $vote=$this->Vote->getVote($id,$uid); $this->set('vote',$vote); $voteCount = count($vote); $this->set('voteCount',$voteCount); $voteShow = $this->Vote->find('all', array( 'fields' => array('SUM(Vote.score) AS score','count(id) as countId'), 'conditions'=>array('Vote.type_id'=>$id), )); $this->set('voteShow',$voteShow); ``` model: ``` public function getVote($id,$uid) { if (empty($conditions)) $conditions = array('Vote.type' => 'blog', 'Vote.type_id' => $id, 'Vote.user_id' => $uid); $users = $this->find('all', array('conditions' => $conditions, 'order' => 'Vote.id desc' )); return $users; } ``` That code produces this error: ``` Error : An internal error has occurred ``` What does this error mean?