As the others have said, calibre doesn't handle the kepub book format. I made a modification to the driver in calibre 0.9.2 (I think) to give an error when attempting to do an "Add books to library" for a kepub from the device list.
Is this what you were trying to do, or something else? In any case, a kepub can't be added to the calibre library. If you need to add the books, get the epub version as suggested above and in the other thread.
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