We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
There do not appear to be chapters in your file - yet there ARE!
MAKING AN EBOOK ISSUE
Having a hard time formatting my .docx file so that lulu will proceed with the EBook interior file.
I have selected-created Headings, only two layers (1 for my title, 1 for my copyright page and then 2 for all the chapters of the book, I do not require a third level).
It must be said I work on a French software (for me, "Heading 1" is "Titre 1").
What am I missing???
Why do I get the error message : there do not appear to be chapters in your file...