Invalid File Message-Kobo Slick ER701
I've downloaded books from Amazon, removed DRM and added to Calibre Library. When I transfer to reader, I see the book on the reader and the file size, but when I try to open I get the message Invalid File and the book will not open. I have done numerous books this way and all have worked fine. The book in question will open in the digital reader with no problem. I have determined that all books by this author give me the invalid file message. Thanks for any help.
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