[Google Maps API v3] kml with heatmap

[OBPG Admin]

Working with density heat maps using http://jjguy.com/heatmap/

This is my output KML file:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2";>
  <Folder>
    <GroundOverlay>
      <Icon>
        <href>classic.png</href>
      </Icon>
      <LatLonBox>
        <north>90.0000000000000000</north>
        <south>-90.0000000000000000</south>
        <east>180.0000000000000000</east>
        <west>-180.0000000000000000</west>
        <rotation>0</rotation>
      </LatLonBox>
    </GroundOverlay>
  </Folder>
</kml>

Adding KML overlay:
   // KML layer                                                             
                                                                            
                                                                 
   var kmlLayer = new google.maps.KmlLayer('data.kml', { preserveViewport : 
true });                                                                     
                                                       
   kmlLayer.setMap(Map.map);    

Nothing shows up.

Any ideas? Is there something I can do to see if the layer is being loaded? 
Is the LatLon box an issue?

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