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.
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Unknown issue while trying to convert your file to an EPUB.
I tried to upload a technical book that contains 234 pages. The file contains custom styling such as various fonts for code examples). When I uploaded the docx document I got textbox error. I didn't use text boxes.
Then I copied a chunk of text and created a test.docx file. It validates in EPUB Validator (beta).
But I get an unknown error from Lulu wizard.
I have attached the document. If anyone can help to solve this issue, it would be great.