Using ADE 3.0 to transfer ebooks to my nook simple touch, the books will not open giving an error saying "User not activated"

Using ADE 3.0 to transfer ebooks to my nook simple touch, the books will not open giving an error saying "User not activated"

I am renting the books from my public library and I can open the books using the ADE app on my mac but once they are transferred to my Nook they will not open. What do I do?