อับโหลดรูปเข้า facebook ไม่ได้ครับ [php , facebook api]

Fatal error: Uncaught CurlException: 3: No URL set! thrown in /home/vhosts/www.xxx.com/app/facebook-php-sdk/src/base_facebook.php on line 774

<?php
require 'facebook-php-sdk/src/facebook.php';
$facebook = new Facebook(array(
    'appId'  => 'xxx',
    'secret' => 'xxx',
    'cookie' => true,
));
$user = $facebook->getUser();
if ($user) {
  $facebook->setFileUploadSupport(true);
  //Create an album
  $album_details = array(
        'message' => 'album_description',
        'name' => 'album_name'
  );
  $create_album = $facebook->api('/me/albums', 'post', $album_details);
  //Get album ID of the album you've just created
  $album_uid = $create_album['id'];
  //Upload a photo to album of ID...
  $photo_details = array(
    'message'=> 'Photo message'
  );
  //$file = $_SERVER['DOCUMENT_ROOT'] . "/app/pic/" . rand(1,5) . ".jpg";
  $file = $_SERVER['DOCUMENT_ROOT'] . "/app/pic/1.jpg";
  $photo_details['image'] = '@' . realpath($file);
  $upload_photo = $facebook->api('/'.$album_uid.'/photos', 'post', $photo_details);
}
?>