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Hi,
Found a sample chapter of that book on the Baen website and used its html and received the following when I tested it for being well-formed by Gumbo:
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line: 2 col: 1 type 40 @1:1: This is not a legal doctype.
@2:1: This is not a legal doctype.
<!DOCTYPE html PUBLIC "+//ISBN 0-9673008-1-9//DTD OEB 1.2 Document//EN" "http://openebook.org/dtds/oeb-1.2/oebdoc12.dtd">
So all it is complaining about is the DOCTYPE not being an epub2 DOCTYPE. If you turn on Clean On Open in Sigil preferences it will still happily load and parse that file.
Your error message in the image cites the exact same line so your problem is probably the same non-standard doctype as well. Simply turn on Cleaning and it should load just fine into CodeView. You can then modify it if need be, otherwise leave it alone.
KevinH
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