I changed the front matter headings and deleted one section. This meant I needed to add a page at the end to make up an even number page count. I did this by adding blank spaces to force a new page to be added. But, when I uploaded my file to my distributor, I got another error message, this time “Invalid epub file.” Please help! Did this happen because I forced a new page with blank spaces, and is there a better way to add a blank page with no heading? I’m fine with the page number being printed on it. Thanks!