: Re: Help creating a toc.ncx file for compatibility with epub 2 I have created a toc.ncx file in EPUB3 for backwards compatibility with EPUB2 . I used that file in a DRM-free book (replacing the

@Julie

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Instead of using Adobe DE (which isn't always reliable), you should use the epubcheck validator online on your epub file. validator.idpf.org/
You can download a copy of the validator tool on your own machine if you wish.

That will give you more verbose and actionable error messages.

Here are some examples of error messages: github.com/IDPF/epubcheck/wiki/Errors (unfortunately this list doesn't seem to be complete or up to date).

My guess based on a cursory reading of your file is that there are no file references here. Here's an example from one of my own files:

<navPoint id="d0e1652" playOrder="7">
<navLabel>
<text>The Silver Link</text>
</navLabel>
<content src="silver-link.xhtml"/>
</navPoint>
<navPoint id="d0e2128" playOrder="8">
<navLabel>
<text>Johnny Kinkaid</text>
</navLabel>
<content src="johnny-kinkaid.xhtml"/>

But your .ncx file has an empty reference;

<content src="" />

As for your other questions, let me say that I have never had to worry about toc.ncx file problems before ... mainly because I auto-generate the file from Docbook.

The meta stuff you have is exactly what I have; IIRC, it had to do with accessibility and spoken books.

In my experience, kindlegen almost always produces a working file for kindle if you have given it a valid .epub file.

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