Uncaught OAuthException: (#200) The user hasn't authorized the application to perform this action

I'm trying to post to my facebook group wall but I keep on getting the above error. Can anyone please tell me what I might be doing wrong here? I have checked the Facebook documentation but I still can't seem to fix it myself. My code is as follows:

$facebook = new Facebook(array(
  'appId' => $app_id,
  'secret' => $app_secret,
  'perms' =>开发者_如何学运维; 'offline_access, user_groups, publish_stream',
  'cookie' => true
));


$result = $facebook->api(
     '/xxxxxxxxxgroupid/feed/',
      'post',
      array('access_token' => $facebook->getAccessToken(), 'message' =>  'Playing around with FB Graph..')
);

I think you need user_groups extended permission.

Use Try before, that sould work fine

try {
        $params = array(
            'message'       =>  "Hurray! This works :)",
            'name'          =>  "This is my title",
            'caption'       =>  "My Caption",
            'description'   =>  "Some Description...",
            'link'          =>  "http://stackoverflow.com",
            'picture'       =>  "http://i.imgur.com/VUBz8.png",
        );

        $post = $facebook->api("/$user/feed","POST",$params);

        echo "Your post was successfully posted to UID: $user";

    }
    catch (FacebookApiException $e) {
       $result = $e->getResult();
    }