Originally Posted by wallcraft
First, make sure you can read the ebook with Desktop Adobe Digital Editions. Second, make sure you have loaded the correct plug-in, there is one for Adobe and one for B&N epub DRM. Then try importing again.
I discovered I had not loaded the correct plug-in - I didn't go far enough into the directory of Calibre plug-ins for the right zip file. It is working like a charm now. Thank you for your reply.