I'm trying to add an ebook onto IngramSpark using their book creation tool. I made the original epub in Sigil. When I get to the content files validation section I get the following errors:
Quote:
(RSC-005): /index_split_000.html: Error while parsing file: value of attribute "lang" is invalid; must be an RFC 3066 language identifier
(RSC-005): /index_split_000.html: Error while parsing file: value of attribute "xml:lang" is invalid; must be an RFC 3066 language identifier
(RSC-005): /index_split_001.html: Error while parsing file: value of attribute "lang" is invalid; must be an RFC 3066 language identifier
(RSC-005): /index_split_001.html: Error while parsing file: value of attribute "xml:lang" is invalid; must be an RFC 3066 language identifier
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But in index_split_000.html (and 001) I have: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
And as far as I can see "en" is a 3066 identifier. Does anyone have any clue what's going wrong?
Thanks in advance.