Php – the user hasn’t authorized the application to perform this action(#200)

Hi I need to post message on facebook fan page

this is my code
When I run this code I have following error
(#200) The user hasn't authorized the application to perform this action
if access_token token problem ?
how can i create access_token

<?php
    require 'facebook-php-sdk-master//src/facebook.php';

    $appId = '1617691071796143';
    $secret = 'd84420ccfe2fa7eecac50ca96936bb21';
    $returnurl = 'lankabird.com';
    $permissions = 'manage_pages, publish_stream, offline_access,read_stream';

    $fb = new Facebook(array('appId'=>$appId, 'secret'=>$secret));
    $fbuser = $fb->getUser();

    if($fbuser){

        $page_id = "1596941017191630";
        $page_access_token = "";
        //$page_access_token = "1617691071796143|d84420ccfe2fa7eecac50ca96936bb21";
        $result =  $fb->api("/me/accounts");

        // loop trough all your pages and find the right one
        if( !empty($result['data']) )
        {
           foreach($result["data"] as $page) 
           {
             if($page["id"] == $page_id)
             {
               $page_access_token = $page["access_token"];
               break;
             }
           }
        }
        else
        {
          echo "AN ERROR OCCURED: could not get the access_token. Please verify the page ID ".$page_id." exists.";
        }

        $fb->setAccessToken($page_access_token);

        // Now try to post on page's wall
        try{
            $message = array(
                'message' => "YOUR MESSAGE",
            );

            $result = $fb->api('/'.$page_id.'/feed','POST',$message);
            if($result)
            {
                echo 'Successfully posted to Facebook Wall...';
            }
        }catch(FacebookApiException $e){
            echo $e->getMessage();
        }

    }else{
        $fbloginurl = $fb->getLoginUrl(array('redirect-uri'=>$returnurl, 'scope'=>$permissions));
        echo '<a href="'.$fbloginurl.'">Login with Facebook</a>';
    }
?>