3 years later and I got the very same error! The solution resolved the problem, but the first thing I did was to look at the (errata) and didn't find anything in that. Thanks god I found this old chat in here otherwise I would go crazy!
I have been working with J2EE for the past 3 years but I decided to knock the SCBCD just a week back. I could not run this AdviceClient without moving the classes and I could not sleep yesterday night. Its only today that I saw Kathy's post on this error. It worked!! I was shocked for a moment, but then it was a great relief.