Same problem here. I side-loaded some ePub files that had probably originally been downloaded to my computer from the B&N site. The error message on the Kobo (Forma) was that I needed to register with Adobe Digital Editions. I downloaded ADE v.4, registered the computer, then attached the Kobo to the computer and told ADE to register the Kobo as well.
That all went fine, apparently—no error messages. But those side-loaded books still won't open. Same error message about ADE.
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