Error formatting / re-send the book?

Hello, I did a book on the application and sent it to apple review, they sent me a message to correct the formatting, I was checking and saw nothing wrong with the formatting, I wonder if there is some kind of guideline in the program for me to correct this. also want to know how I can re-send the corrected book? as a new book and tell them? or is there a hidden option for it? Thank you all!