Are you
really still using Sigil 0.3.2?? This has been fixed in later versions of Sigil (which is currently at 0.9.13, just for the record).
Change the following line in toc.ncx:
Code:
<meta name="dtb:uid" content="a0d8cc05-8c3c-48ce-ba5e-13722fae684f"/>
to:
Code:
<meta name="dtb:uid" content="urn:uuid:a0d8cc05-8c3c-48ce-ba5e-13722fae684f"/>
The content attribute in the ncx must now match,
exactly, the unique identifier from the opf (including any prefixes).
Then do it for every book you edit from now on (or upgrade Sigil
)