Quote:
Originally Posted by Leonatus
The message is - more or less, for I have to translate it:
"This EPUB has HTML files that are not well formed or are missing a DOCTYPE, html, head, or body elements. Sigil can automatically fix these files, although this may result in minor data loss in extreme circumstances."
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This has nothing to do with the Writer2Epub. A couple of versions ago, KevinH added a missing doctype check, because HTML files without doctypes are technically invalid, even though EPUBCheck won't report this as an error.
I.e., you'll get the same error message for any number of books created by totally different apps.