Quote:
# ERROR: .epub/content.opf(12): attribute "file-as" from namespace "http://www.idpf.org/2007/opf" not allowed at this point; ignored
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file-as is an option for the author entry, as in:
Code:
<dc:creator opf:role="aut" opf:file-as="MacDonald, George">George MacDonald</dc:creator>
That's taken from a book I made. I'm guessing the file-as you have is part of a meta entry where it's not allowed, or is not preceded by "opf:" as mine is above.