[Erledigt] Facebook Access tokken wird nicht erkannt

[Blackhead77]

define('DS', DIRECTORY_SEPARATOR);
require_once 'autoload.php';

use Facebook\FacebookRequest;
use Facebook\GraphObject;
use Facebook\FacebookRequestException;
use Facebook\FacebookSession;

FacebookSession::setDefaultApplication('ID', 'Secret');

// If you already have a valid access token:
$session = new FacebookSession('accesstokken');

// If you're making app-level requests:
$session = FacebookSession::newAppSession();

// To validate the session:
try {
  $session->validate();
} catch (FacebookRequestException $ex) {
  // Session not valid, Graph API returned an exception with the reason.
  echo $ex->getMessage();
} catch (\Exception $ex) {
  // Graph API returned info, but it may mismatch the current app or have expired.
  echo $ex->getMessage();
}
print_r($session); 

Die Session Variable hat auch einen Accesstokken

Nur wenn ich dann diesen Script Ausführe:

if($session) {

  try {

    // Upload to a user's profile. The photo will be in the
    // first album in the profile. You can also upload to
    // a specific album by using /ALBUM_ID as the path     
    $response = (new FacebookRequest(
      $session, 'POST', '/me/photos', array(
        'source' => 'B/Koala.jpg',
        'message' => 'User provided message'
      )
    ))->execute()->getGraphObject();

    // If you're not using PHP 5.5 or later, change the file reference to:
    // 'source' => '@/path/to/file.name'

    echo "Posted with id: " . $response->getProperty('id');

  } catch(FacebookRequestException $e) {

    echo "Exception occured, code: " . $e->getCode();
    echo " with message: " . $e->getMessage();

  }   

} 

erhalte ich diese Fehermeldung:

Exception occured, code: 2500 with message: An active access token must be used to query information about the current user.

Wo ist dass Problem?