"Failed to write to destination" error message: one ebook visible on Adobe Digital Editions, but getting error message when moving to device

I have tried downloading a second time from computer to A.D.E. and then tried to add to device.

I've dragged and dropped both into A.D.E. from my computer, and to the device within Adobe Digital Editions.

I cannot manage to get this one title to the device.

Suggestions?

This is a library ebook.