Trying to download library book

I have never had any trouble in the past, however in the last few days when trying to download a overdrive library book onto my kobo aura h20 I keep getting a warning on the device saying that my "eReader is not authorized to open this book" "This book is protected by (...) DRM. Because you previously deauthorized your e-reader you need to re-import the book". I am not aware of de-authorizing my e-reader. I have tired de-authorizing and re-athorizing both my computer and kobo as well as un-installing and re-installing Adobe Digital Editions. I have tried using different browsers, as well as different books. However no matter what I do I keep getting the same warning.