Error when Comment on facebook
===

    I have to send gift as comment to facebook post using php graph api.I have facebook post id and gift url.I use following function:
        public function comment($postId,$message){
                try {
                    $comment = $this->facebook->api("/$postId/comments", 'post', array(
                        'message' => $message,
                            )
                    );
                    return $comment;
                } catch (FacebookApiException $e) {
                }
            }
 i got the error like following:
 (#803) Some of the aliases you requested do not exist
 

