At this time, we're investigating the problem and looking for a solution.
If you've encountered this issue while converting your file, we suggest attempting to create and upload an EPUB directly to our system.
While there are a number of EPUB conversion options, Calibre (Download Here) has shown the best results for creating an EPUB for the Lulu system. Please review their extensive Help resources (Found Here) to create an EPUB 2 that our system can validate.
We've also created this Forum Thread. Post questions here and we'll do our best to respond and assist.
book cover designer
I'm a print and e-book cover designer in New York with over 10 years of experience designing and art directing in-house at major publishing houses, including HarperCollins, Penguin Random House, and St. Martin's Press. You can see my portfolio at www.mimibark.com and send me a note so we can chat about working together!