Hi Deborah,
I can't really tell what problem you're running into because an InvocationTargetException wraps another Exception (as a way of passing it up the call stack). Can you look through your logs and see what the wrapped Exception is?
Without knowing the root exception, I'd guess that it's likely that there's a formatting error in your struts-config.xml.
Jon Emerson
Adobe Systems, Inc.
http://www.jonemerson.net/