Assuming that your ADE is activated try redownloading the book. The file may be corrupted. If the second download doesn't work then you may want to be sure that your ADE is activated and then contact the library. You might also try a different book.
This won't get it onto your DX though. If it's a liberated PDF then you're good but if it's a liberated ePub then it will need to be converted. I can't give you directions on how to liberate or link to where the scripts reside but google is your friend.