Quote:
Originally Posted by nabsltd
I did not find any special characters, but by using the "change selected word to" and replacing the offending word with itself, the error went away. Unfortunately, this also changed the file in another way.
This change makes the file no longer valid for EPUB 2...it requires the !DOCTYPE directive.
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One reason why I use both Sigil and calibre's editor. My last step with editing an epub is to open it in Sigil and use the Mend and Prettify tool (Tools => Reformat HTML => Mend and Prettify All HTML Files). I then run epubcheck and if it says no problems, save and exit.