Hi
I had a similar problem about a month ago except I received the message "fail while preparing data". The solution to my problem which may work in your case was to clear the existing program data which takes about an hour and then try another daily call. To clear your guide data, go into Messages & Setup, System Reset, & Clear Program Data & To Do List. This does not delete your Now Showing programs. Here is the thread if you want to check it out.
http://forums.oztivo.net/showthread.php?t=605
I'm just a tivo newbie so some of the tivo experts may have a better idea but this may be worth a try.
All the best
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