title: fb.ui apprequests giving me error code 2
body: <p>So I have an app using the facebook javascript SDK(this is not a canvas app, it's standalone, just using the fb api to send some invites) I'm currently running it via localhost, it allows people to authorize the application and within a jQuery onclick handler it displays the following function to the logged in fb user.</p>
  
  <pre><code>function sendRequestViaMultiFriendSelector() {
    FB.ui({
          method: 'apprequests',
          show_error: true,
          title: 'Title here',
          message: 'I\'ve sent you a message'
    }, function(result){
          alert(result);
    });
  }
  </code></pre>
  
  <p>the FB.ui request works, the dialog appears I select an user and then I get the following error message:</p>
  
  <pre><code>API Error Code: 2
  API Error Description: Service temporarily unavailable
  Error Message: User can't send this request: Unknown error
  </code></pre>
  
  <p>I'm currently logged in as a test user that has befriended another test user, they have both authorized the application.</p>
  
  <p>I'd be grateful for any advice on how to continue.</p>