Thank you all for the suggestions. I now tried the following: In calibre I used convert from mobi to epub. Same error in Kindle, "cant open this file". Next I tried In Calibre convert to AZW3, and got same error?
In that the book came from Gutenberg, should I try to take it out of Calibre, and start over? To do that do I use the "remove book" in the Calibre toolbar?
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