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.
eBook ISBN issues
Hello, created an eBook project yesterday with my own ISBN.
Had to delete the project and start a new one today.
When I enter the ISBN, lulu complains that the ISBN has been already assigned!
The original project has been deleted, and I have to use this ISBN.