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No, If you read the error message it tells you that it is missing its DOCTYPE (assuming it has html, head and body tags), which is required by the epub spec. It is an open issue on epubcheck to test and report this. Calibre does not follow this aspect of the spec. Sigil does and has for years prior to a couple of releases ago when auto mending to move things to its standard layout always fixed it. Now that we no longer move things to standard locations, the auto fixing is no longer done.
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