Just the first three errors that Flightcrew reports for that ePub from Baen:
Quote:
This OPS document is reachable but not present in the OPF <spine>. "Reachable" means that a reference of some kind that points to this resource exists in the epub.
value 'US English (en-us)' does not match any member types of the union
attribute 'language' is not declared for element 'script'
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My guess is that that something is malformed enough that it's tripping calibre up.