title: "OAuthException: (#100) Invalid parameter" by creating an event
body: <p>i try to create a facebook event with the open graph and the php sdk.</p>
  
  <p>i use this code:</p>
  
  <pre><code>    $facebook = new Facebook(array(
          'appId'  =&gt; 'XXXXXXXXX', 
          'secret' =&gt; 'XXXXXXXXXX', 
          'cookie' =&gt; true // enable optional cookie support
      ));
      $user = $facebook-&gt;getUser();
  
  $event_start = time() + (7 * 24 * 60 * 60);
  
  
  if ($user) {
    try {
      $event = $facebook-&gt;api("/me/events","post",array(
        'title'=&gt;'My Event Name',
        'start_time'=&gt;$event_start
        // etc add your other event info here
      ));
    } catch (FacebookApiException $e) {
      echo($e);
    }
  }
  </code></pre>
  
  <p>i have this permissions: create_event,rsvp_event</p>
  
  <p>and i get this error:</p>
  
  <p><strong>OAuthException: (#100) Invalid parameter</strong></p>
  
  <p>how can i solve the problem?</p>