We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Having Problems Getting an EPUB
I've been reviewing my file for errors for over a week. Every time I submit it is rejected. Have tried all file types except pdf. Working in open office. Have reviewed and revisited all the formatting details numerous times and I can't seem to figure out what's wrong.
Would anyone be willing to look at my file and offer some advice?