title: Error in facebook api using php SDK
body: <p>I am using facebook PHP SDK to access the friend list </p>
  
  <pre><code>    include_once("../fb-config.php");
      include_once("../facebook.php");
  
   try{
  
   $facebook = new Facebook(array(
     'appId'  =&gt; 'FACEBOOK_APP_ID',
     'secret' =&gt; 'FACEBOOK_SECRET',
     'cookie' =&gt; true, // enable optional cookie support
   ));
   $uid=$facebook-&gt;getUser();
   $data = $facebook-&gt;api( array( 'method' =&gt; 'friends.getappusers') );
   var_dump($data);
  } catch (FacebookApiException $e) {
      echo $e-&gt;__toString();
    }
  </code></pre>
  
  <p>i get the following error </p>
  
  <blockquote>
    <p>Exception: 104: Requires valid
    signature</p>
  </blockquote>
  
  <p>Please help</p>