Originally Posted by
darrenan
The issue might be that you haven't defined a category from which the chapters will be built. At the top of the "Story" window, expand the section that currently contains "Uncategorized", click the '+' button, then click the brown button and edit the new category name so that it also is prepended with a number and contains the desired chapter name. For example: "001 Chapter 1: My Stuff". Each category you create in this way will become a top-level chapter in the generated module.
Move all of your story entries into that category. Then try exporting again and see if that gets things working.