Problems transferring borrowed books from the library to my Kobo Glo Ereader

I have never had a problem borrowing books from the library and transferring them onto my kobo glo ereader but now it seems every time I try to do this I get error messages. The most recent being... "your ereader in not authorized to open this book. You need to re-authorize your ereader with your adobe id using adobe digital editions." I have tried authorizing, reauthorizing, factory reset on ereader. Any help would be apprecitated.