Inside of the VBA Editor, Tools->References. This will bring up the
"References" dialog box. You should see a check box for Excel that says
something like "missing". Clear that check box, and then scroll down looking
for the reference to "Microsoft Excel", and select that. Save the project
and try it again. I can't remember the exact line, but I think it will be
10.0 Object Library.
Cheers,
Peter Funk
Autodesk, Inc.