I am using Facebook API code to publish a post on pages. But occurred the error.
I've uploaded the code on my domain even I am getting this problem.

Graph returned an error: (#200) The user hasn't authorized the application to perform this action

FB API Code:

  <?php 
    require_once(__DIR__."/fb-sdk/src/Facebook/autoload.php");

    $fb = new Facebook\Facebook([
       'app_id' => 'MY_APP_ID',
       'app_secret' => 'MY_SECRET',
       'default_graph_version' => 'v2.2',
    ]);
    $linkData = [
       'link' => 'www.mywebsite.com',
       'message' => 'Testing API'
    ];
    $pageAccessToken ='MY_ACCESS_TOKEN';
    try {
       $response = $fb->post('/me/feed', $linkData, $pageAccessToken);
    } 
    catch(Facebook\Exceptions\FacebookResponseException $e) {
       echo 'Graph returned an error: '.$e->getMessage();
       exit;
    }
    catch(Facebook\Exceptions\FacebookSDKException $e) {
       echo 'Facebook SDK returned an error: '.$e->getMessage();
       exit;
    }
    $graphNode = $response->getGraphNode();
 ?>

You can see the advance setting of API in the image, is there anything missing in code or settings?