Notebooks for iPhone Answers

If you use Notebooks' Dropbox Sync function and receive one of the above errors, please take a close look at the titles of books and notes you are about to sync. Dropbox is unable to sync documents that contain "illegal" characters in their titles. The characters are listed here: http://en.wikipedia.org/wiki/Filename#Reserved_characters_and_words

Another reason for error 403 is that two notes or books have the same title but in different case; for Dropbox, "Inbox" and "inbox" would be the same, and trying to sync these folders would result in an error 403.