title: Facebook apprequests dialog error
body: <p>I am using FB.ui, with apprequests method, in an application on facebook. When I try to send requests to 50 friends I get a 500 internal server error from facebook's function uiserver.php, and the callback function of FB.ui is never called. Do you know what might causing this error and how can I handle it, in order to print a message to the user about this error? </p>