The whole process is driven by a macro. That you should be asking this suggests you haven't paid much attention to the associated discussion in the thread.
The document in the attachment works just fine when the instructions are followed. Likewise, if implemented the same way in your own document, it will continue to work just fine. Since I can't see what you're actually doing, I can't say where the error is. That said, I'm surprised you're getting any kind of error message given the presence of error-handling code in the macro - that suggests you've changed it somehow.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]