EPUB Check and Can't Send to iTBooks, Google Play or Amazon

I have tried and failed to export a version of my book that passes EPUB Check…from what I’m being told, it’s because of the front matter and I’m guessing that’s the copyright notice and auto generated titling and stuff. I’m using Draft2Digital and have tried nearly 10 times and it fails each time. I’ve even exported without some of the front matter in the print version and it still fails. On the plus side, it looks good and just fine for my digital downloads through my site.

Any help on what to do to pass an epub check…?