Gmax export issues

#1
I'm exporting ground polys in gmax and keep on getting this message:
ERROR: Failed loading source part dictionary (Data at the root level is invalid. Line 3, position 1.)

ERROR:
Failed processing part dictionary file!!
ERROR:
System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.FlightSimulator.XPartDictLib.XPartDict.ValidateDocument()
at Microsoft.FlightSimulator.XPartDictLib.XPartDict.LoadFile(Stream InputStream)
at Microsoft.FlightSimulator.XPartDictLib.XPartDict.Process()
 
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