Fehler 0 bei Ausführen eines Codes für ein Facebook Post

<?php
require_once 'facebookapp/vendor/autoload.php';


//Seitenzugriffsschlüssel
$access_token = "Mein Access Token von der Facebook App";


$config = array();
$config['app_id'] = 'Meine App ID';
$config['app_secret'] = 'Mein App Secret';
$config['fileUpload'] = false; // optional


$fb = new \Facebook\Facebook($config);


// POST parameters
$params = array(
"access_token" => $access_token, // see: https://developers.facebook.com/docs/facebook-login/access-tokens/
"message" => $message,
"link" => "URL zu besagter Internetseite",
"picture" => "URL zu Bilddatei",
"type" => "website",
"name" => "Test Name",
"caption" => "Test Caption",
"description" => "Test Description"
);


$helper = $fb->getRedirectLoginHelper();


// post to Facebook
try {
$ret = $fb->post('/me/feed', $params);
echo 'Successfully posted to Facebook';
} catch(Exception $e) {
echo $e->getMessage();
}
?>