RPC_E_SERVERFAULT on Microsoft Word Automation

Question

I create text documents from templates (.dot) through Microsoft.Office.Interop.Word. The code below works on some templates, but not on others: where it does not work, it throws an exception RPC_E_SERVERFAULT. What is it that could be the cause, and how can I fix it? (An exception occurs on the second line.)

wordApp = new Microsoft.Office.Interop.Word.ApplicationClass();
wordDoc = wordApp.Documents.Add(ref oTemplate, ref newTemplate, ref docType, ref isVisible);
wordApp.Visible = false;
wordDoc.Activate();

Answer 1

You will hate me and lower me, probably, but in all my .NET experience working with COM Interop is PIA (pun / PIA also means Primary Interop Assemblies).

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