newbie...what is fileset?

Am trying to make dvd copy. used mac the ripper with no problem. then tried to use dvd2onex and when I am asked to create a folder (I simply create new folder and title it "my_movie_dvd". I get a message that says,"this folder does not contain a valid dvd fileset". I am basically trying to follow the directions posted by media guru in a 2004 posting. Can you help? Thanks

 

Here is a good explanation:

http://stream.uen.org/medsol/dvd/pages/dvd_format_filestructure.html