I have partially identified the source of the "exception. In a new copy of my book, I followed my usual Word: HTML from Word: Calibre fro the HTML: validate in Sigil, and got the "exception" notice. I then tried a substitute procedure: Word to HTML; the used Sigil to convert to epub, which lost my chapter breaks but these were easy to insert in Sigil, the valldation worked fine. I then used Calibre to edit line spacing and margins in the epub file and it went through validation again in FlightCrew. So, the flaw apparently happens in the Word/HTML to Calibre sequence, probably when Calibre converts from the HTML file. At any rate all is well for now. So your advice was good, Toxaris.
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