CD Not Found

["D.Asensio" <david@xxxxxxxxxx>]

I have followed the doc written by Gene Czarcinski at 
http://czarc.net/HOWTO-Updating-fc3.html and when I try to install my 
distribution I get a 'CD Not Found' screen after selecting my language 
and keyboard...

I have tried to insert all the CD's generated but I always get that error.

What could I have done wrong? How can I solve it?