Error when tryin to delete entries in the guestbook

HI when i try to delete entries in the guestbook i get the following error and all im able to
delete is the latest entry.

Is there somthing i might have overlooked when setting up the guestbook?

Try copying the file "functions.php" and "gbclass.php" into your admin folder. It looks like for whatever reason the path to the functions.php file has been changed or your functions.php file is missing all together.

That did it.

Thanx alot.