Quote:
Originally Posted by Notjohn
I have a somewhat similar problem when uploading a validated epub to Lulu.com. For each of my (Sigil-built) files, I get this error:
Can something similar be done in Sigil or Calibre?
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Does your NCX file contain a <bookmarkSet> section with any of the following tags:
<lastmark>, <bookmark> or <hilite>
If so, simply re-generating the NCX TOC with Sigil should remove them, because Sigil doesn't support <bookmarkSet>.
However, this error might also be caused by undefined named entities, e.g.
&xyz;. Did you use any unusual named entities in these books?