When I make a request for web page content (chatlog) in a short time it troughs a 403 forbidden error: Access to this resource on the server is denied!

Here is my AJAX code

      var auto_refresh = setInterval(
    function ()
        {
               $.ajax({
                url: "chatlog.html",
                cache: false,
                success: function(html) {
                    $(".chatbox").html(html);
                }
                });

        }, 10); // refresh every 10 milliseconds

Please help, I have been working on this for hours

EDIT: I fixed it