Your My Social Book can't exceed 500 pages. If yours has too many pages, try to reduce the content by first:

  • reducing the time range;

    and then by: 
  • splitting the book into multiple books with different time ranges;
  • removing types of content on the Edit content section;
  • removing some posts by clicking on the Remove Specific Posts button o the Edit content section;
  • limiting the number of comments to be printed per post in the Options section.

NB : The limit of the number of pages is 500 for quality reasons, it makes a book about 4.4 pounds, and 2.8 inches thick.