[mapguide-users] Fusion error on initial map display

[BMason]

We started getting this fusion error 2 weeks ago and have found no solution.
We are using MG2.4   When we reload the map, sometimes the error goes away
and sometimes it doesn't..  Can anyone help? 
 
Fusion Error: 
WARNING: Exception occurred in AJAX callback.
Message: Cannot read property 'style' of undefined
Location: undefined (undefined)
Response:
{"sessionId":"e565c49c-9ea0-11e5-8000-005056002011_en_MTI3LjAuMC4x0AFC0AFB0AFA","mapId":"Library:\/\/FREMP\/Maps\/BIEAP_FREMP_Map.MapDefinition","metadata":null,"metersPerUnit":1,"wkt":"PROJCS[\"WGS84.PseudoMercator\",GEOGCS[\"LL84\",DATUM[\"WGS84\",SPHEROID[\"WGS84\",6378137.000,298.25722293]],PRIMEM[\"Greenwich\",0],UNIT[\"Degree\",0.017453292519943295]],PROJECTION[\"Popular
Visualisation Pseudo
Mercator\"],PARAMETER[\"false_easting\",0.000],PARAMETER[\"false_northing\",0.000],PARAMETER[\"central_meridian\",0.00000000000000],UNIT[\"Meter\",1.00000000000000]]","epsg":900913,"siteVersion":"2.4.0.7096","mapTitle":"BIEAP_FREMP_Map","mapName":"BIEAP_FREMP_Map56686fe6621f2","backgroundColor":"#ffffff","extent":[-13743276.300456,6263962.313227,-13631678.254384,6350915.0676314],"layers":[{"uniqueId":"e8a101a8-9ea0-11e5-8000-005056002011","layerName":"Site","layerTypes":[2],"resourceId":"Library:\/\/FREMP\/Layers\/Field2015\/Site.LayerDefinition","parentGroup":"e8571a70-9ea0-11e5-8013-005056002011","selectable":true,"visible":true,"actuallyVisible":false,"editable":true,"isBaseMapLayer":false,"legendLabel":"Habitat
Compensation
Sites","displayInLegend":true,"expandInLegend":true,"minScale":"0","maxScale":"infinity"},{"uniqueId":"e8a101a8-9ea0-11e5-8001-005056002011","layerName":"Points_Final","layerTypes":[0],"resourceId":"Library...:true,"expandInLegend":false,"parentUniqueId":"e8571a70-9ea0-11e5-8001-005056002011","visible":false,"actuallyVisible":false,"isBaseMapGroup":false},{"groupName":"Habitat
Inventory","legendLabel":"Habitat Inventory (2006, updated…



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