Has the process of using iPhoto to upload a photo book ever worked for you on your computer? Have you been able to make a test book and view it? (look at some of the previous posts to this thread)
When I was having difficulty getting my book uploaded, I never received any error messages. It would just hang. Can you make any sense out of the error message(s) you get? Maybe you could enter the error message into Google and see if you get a hit?
How many pages in your book? If your transmission rate is very slow and the book is large, a time out problem could be in play. When you try to upload the book, make sure you are NOT doing anything else with the computer -- no other tasks running. You could create a real small (like with few pages) test book and send it up for printing to see if it is a time or page problem. Test the system and than delete the test book. I think you have several minutes to delete.
Good luck.
Nortske