Kobo ereader problem opening book from Adobe download

first time opening a downloaded library book and I get the following "Your eReader is not authorized to open this book....This book is protected by Adobe Digital Rights Management (DRM). You need to re-authorize your eReader with your Adobe ID using Adobe Digital Editions (ADE). Please visit help.kobo.com for more information" I contacted Adobe Chat and de authorized and then Re authorized my computer.  I then re downloaded the library book.  I can open the complete book in Adobe but when transferred to my e reader I still get the error above...Can you please help me with this