Add commandbar problem

[X-Men]

I am writing my first Excel Add-in by following instructions from MSDN.
("Tips and Tricks: Building Microsoft Office Add-ins with Visual C# .NET and
Visual Basic .NET")
I did exactly the same as in the article, but VS throw me the following
exception in function AddWordToolBar, to be more precise:
word.CommandBars.Add method. Below is the error description:
"A first chance exception of type 'System.ArgumentException' occurred in
testaddin1.dll

Additional information: The parameter is incorrect."

Thanks for you help in advance.

 

[X-Men]

By the way, I use VS .Net 2002 and office version is 2000.
Thanks,