I’m trying to import an EPUB format, and getting the above error msg. I’ve imported others (although I did not notice if they were EPUB) and eventually got them through the maze of Adobe Digital and then Calibre. No go with this one. I do see that in Adobe, it doesn’t actually save the file into its library like it did for the other books. Hmmmph.
Please check your email. I’ve just converted the book for you to PDF format, give it another try.