Hi. You didn't report what the error actually was, but...
SB generates core methods automagically for the entity. You'll see those as createGuestbook(long), addGuestbook(Guestbook), deleteGuestbook(Guestbook), updateGuestbook(guestbook), etc.
Often times, however, this actually leaks business logic outside of the service layer. So as developers we will often add methods to the service that offer similarly named methods except use a simpler list of args so the business logic can remain inside the service layer.
The same has happened here - the addGuestbook() method that only requires the values needed to really add a new guestbook has been created that encapsulates the actual logic behind adding a new guestbook.
When you have a choice like this between the default method and an extension method with exploded params, always use the latter.
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