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.
When does Lulu assign an ISBN?
I see that, where applicable, Lulu will assign an ISBN and automatically put it on a cover that is designed using the Cover Designer feature. However, it is also necessary to include the ISBN on the copyright page in the interior content. This sounds like a cart-and-horse issue.
Do I use the Cover Designer to get an ISBN and then go back and update my copyright page before uploading the interior content? Or is there a way to get the Lulu-assigned ISBN at an earlier stage in the process?