@plutarion: Usual suspects: Make sure the hack is up to date (i.e., snapshots). Make sure the date/time is sane. Make sure those books are actually sane, too, in terms of metadata pertaining to the cover. And double-check that they're not humongously huge.
(Processing manually is technically possible, but if the automatic processing fails, there's a good chance it's for a good reason, and doing it manually wouldn't help).
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