Getting Error converting MS-Word to PDF using ABCpdf

Question

I'm trying to convert a Doc file into a PDF usin ABCpdf:

            using (Doc objDoc = new Doc())
            using (XReadOptions xr = new XReadOptions())
            {
                xr.ReadModule = ReadModuleType.MSOffice;
                objDoc.Read(@"C:\Code\Website\App_Data\ContentRepository\0\6\10\test.doc", xr);
                objDoc.Save(@"C:\Code\Website\App_Data\ContentRepository\0\6\10\test.pdf");
                objDoc.Clear();
            }

I get the following exception

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: path1

[ArgumentNullException: Value cannot be null.
Parameter name: path1]
   System.IO.Path.Combine(String path1, String path2) +14696197
   WebSupergoo.ABCpdf8.Internal.WordApplication..ctor(Options bootOpts) +149
   WebSupergoo.ABCpdf8.Internal.MSOfficeApplicationPool.GetWord() +140
   WebSupergoo.ABCpdf8.Internal.MSOfficeApplicationPool.GetAppForFile(String path) +206
   WebSupergoo.ABCpdf8.Internal.MSOfficeDetails.Importer.ImportImplExportFromApp(Doc doc, String path, XReadOptions opts) +208
   WebSupergoo.ABCpdf8.Internal.MSOfficeDetails.Importer.Import(Doc doc, String path, XReadOptions opts) +239
   WebSupergoo.ABCpdf8.XReadOptions.Read(Doc doc, String path, ReadModuleType module) +318
   WebSupergoo.ABCpdf8.XReadOptions.Read(Doc doc, String path) +68

What am I missing here ?