Please go to the Apple logo at the upper left of your computer screen to About This Mac and give me this information: The exact system Version (listed right under Mac OS X) Processor Memory
Click on the first icon in the Dock the "Finder", then click on Go at the top of the screen, you will see a drop down menu, go to Utilities. When that opens double click on the application called Disk Utility. When Disk Utility opens you will see your hard drive (usually Macintosh HD) on the left. Highlight your hard drive and click on Verify Disk on the far right. If that is OK in green type, then click on Repair Disk Permissions on the left.
Note: If Verify Disk is not OK try to Repair. If Repair is successful then Repair Disk Permissions if it is not successful let me know.
It is the list of icons at the bottom of your screen
As long as Verify disk was ok just let Repair Permissions finish. Then quit that and quit iPhoto too, hold down the Option or ALT and Command keys and start iPhoto. You will see an iPhoto Library First Aid window, select rebuild the Database.
Was Verify Disk Ok in green type?
I thought you didn't click on that yet? please Verify Disk again if it fails you need tot select Repair Disk
I did not say to click on Verify Permissions. Please read carefully
OK now Repair Permissions
OK when done quit that and quit iPhoto too, hold down the Option or ALT and Command keys and start iPhoto. You will see an iPhoto Library First Aid window, select rebuild the Database.
Ok let me know
OK try to export the book again
Ok I don't know how big the book is give it some time
OK there may be a problem with the book I'm afraid the only way is to try and export the book as a PDf and see if that also fails:
I gave you a link
That's all I have in my experience if that does not work there is a problem with the book itself. Sorry.