$.ajax not working in IE

$.ajax not working in IE

I'm using the following code:

$.ajax({
     url: "ChartData.xml",
     async: false,
     success: function(Data) {
          $(Data).find("Point").each(function() {
               var x = $(this).attr("x");
               var y = $(this).attr("y");
               var pt = new JRB.Point(parseFloat(x), parseFloat(y));
               points.push(pt);
          });
     },
     error: function(){alert("error")}
});


In FF and Chrome the success function is called but in IE it the error is called. I can't figure out what is wrong. Any help is appreciated. Thanks.