What was the title? Sometimes that happens when they have "pulled" the book. You have it on your computer because it downloads a copy to your harddrive, on your nook iphone it reads it from the website, the book may be gone.
dan_public wrote:When I tried to read the book, it displayed an error that "nook could not open this eBook at this time. Please try again."
My husband got that message with a book we'd paid for. Once he turned his iPhone off and back on again, the ebook downloaded fine. Try rebooting your phone -- sometimes it helps!