Illustrator Scripting :: How To Automate Importing Variable And Datasets Into Graphs Via Scripting

I'm try to automate the importing of the Varaible and datasets into my graphs via Scripting, but the ImportVaraibles() function doesn't seem to work.  Here is my Script, mostly copied from the example script provided with Illustrator (CS5).  And, this works manually, using the file names in the script, via Load Variable Library
 
    Set appRef = CreateObject(strIllistratorVersion)
   
       'Open the file and import the datasets
        Set docRef = appRef.Open(strTemplate & "200-500.ai")
        'docRef.Datasets.RemoveAll
        docRef.Variables("Yearbook").Delete
 
Here is the problem, after I delete the previous library, then this next line, right from the example, does nothing
The script then exits with 'No Datasets in this document'
       
docRef.ImportVariables (strXMLFolder & "Lumber_200-500.xml")
'appRef.DoJavaScript "alert('Template:" & strTemplate & strRange & ".ai  |  XML file:" & strXMLFolder & ""  & objFile.Name & "^')"
        If (appRef.Documents.Count > 0) Then
            Set docRef = appRef.Documents(1)

 [Code]....
 
If I remove that delete line, the script runs, but just uses whatever Variables I had last loaded, not the XML file.
 
It's simply not loading.  What do I need to do to get it to load?