PHP facebook app error

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PHP

Facebook-API

I am making a facebook app and when i go to my canvas link, I get this error

Fatal error: Uncaught OAuthException: An active access token must be used to query information about the current user. thrown in /home/content/03/10899003/html/facebook/src/base_facebook.php on line 1271

When I test the page with test user, I works fine I am running the app sandbox mode and I havent specified an SSL canvas link,

Code:

<?php

   include_once "src/facebook.php";
   $app_id = 'hidden';
   $application_secret = 'hidden';

   $facebook = new Facebook(array(
  'appId'  => $app_id,
  'secret' => $application_secret,
  'cookie' => true, // enable optional cookie support
));

$u=1;

    if ($u<2) {
    $user = $facebook->getUser();
    $uid = $facebook->getUser();
    $me = $facebook->api('/me/friends');
    echo "<br />Total friends".sizeof($me['data'])."<br />";

    echo "<br /> Friends collage<br /><br />";
    foreach($me['data'] as $frns)
    {
    echo "<img src=\"https://graph.facebook.com/".$frns['id']."/picture\" title=\"".$frns['name']."\"/>";

    }

   echo "hello";

    echo "<br /><br /><br />    By <br /><a href=\"http://facebook.com/infostealar\"><img src=\"https://graph.facebook.com/177257699103893/picture\" title=\"infostealar\"/></a>";
echo "hello";
    }
    else
{
    echo "else";
    $loginUrl = "https://graph.facebook.com/oauth/authorize?type=user_agent&display=page&client_id=APPID
    &redirect_uri=http://apps.facebook.com/CANVAS URL/
    &scope=user_photos";
    echo '<fb:redirect url="' . $loginUrl . '"></fb:redirect>';
}