error with function in indesign cc 64bit

When trying to use the function below, I get this error. Upto now we use the 32bit version (cs6), but with the switch to CC, we're using the 64bit version on windows 7 enterprise (64 bit).

Any suggestions?

G

function datum_en_username() {

                                 var get_username = 'myName = GetUserName\n'

          get_username = get_username + 'Set myInDesign = CreateObject(\"InDesign.Application.CS9\")\n'

          get_username = get_username + 'Set myDoc = myInDesign.ActiveDocument\nmyDoc.InsertLabel \"getUserName\", myName\n'

          get_username = get_username + 'Function GetUserName()\n'

          get_username = get_username + 'Dim objWSHNet, strCurrentUser\n'

          get_username = get_username + 'Set objWSHNet = CreateObject(\"WScript.Network\")\n'

          get_username = get_username + 'strCurrentUser = objWSHNet.UserName\n'

          get_username = get_username + 'Set objWSHNet = Nothing\n'

          get_username = get_username + 'GetUserName = strCurrentUser\n'

          get_username = get_username + 'End Function'

          var datum = new Date();

          app.doScript(get_username, ScriptLanguage.visualBasic);

          username = app.activeDocument.extractLabel('getUserName');

          return [datum, username];

}