Saved Epub won't display in Epub Reader

[Coleccionista]

I maybe missing something obvious here but as a new Calibre user I added a RTF source file, converted it to EPUB, chose the "Save to disk | Only EPUB" and when I try to open this epub inside Mozilla (EPUB Reader plugin) the TOC and cover displays fine but any link from the TOC goes to a broken link page like this:

Firefox could not find file: /C:/Users/coleccionista/AppData/Roaming/Mozilla/Firefox/Profiles/lgeeg00l.default/epub/244/"_Toc192588919

Using the "Advance" button to browse chapters seems to work OK so I don't know if this is a problem with the links used in the TOC or a EPUB Reader issue
Viewing the book in Calibre works fine.
btw, the conversion from RTF to ePUB appears to be pretty good

PS: Opening the file in SIGIL and going straight to "Save" seems to fix the issue, there must be some kind of problem with the links generated in the toc.ncx file

[kovidgoyal]

hard to say without looking at the file in question

[Coleccionista]

Ok, so this is a different file but the contents of toc.ncx are:

<navMap>
<navPoint id="1d2b6af4-649e-426b-9a5c-7d9f2e458239" playOrder="1">
<navLabel>
<text>Iniciar</text>
</navLabel>
<content src="titlepage.xhtml"/>
</navPoint>
</navMap>
</ncx>

Basically empty TOC for EPUB Reader save the "Start" link

I open the file with Sigil and a full TOC appears in the TOC Editor window, I just open the file and click Save and voila a full working TOC appears in Epub Reader.

Extract of toc.ncx after open&save with Sigil

<navMap>
<navPoint id="navPoint-1" playOrder="1">
<navLabel>
<text>EL TESTIGO MUDO</text>
</navLabel>
<content src="Text/index_split_000.xhtml"/>
<navPoint id="navPoint-2" playOrder="2">
<navLabel>
<text>Agatha Christie</text>
</navLabel>
<content src="Text/index_split_001.xhtml"/>
</navPoint>
<navPoint id="navPoint-3" playOrder="3">
<navLabel>
<text>GUÍA DEL LECTOR</text>
</navLabel>
<content src="Text/index_split_002.xhtml"/>
</navPoint>
<navPoint id="navPoint-4" playOrder="4">
<navLabel>
<text>capítulo II</text>
</navLabel>
<content src="Text/index_split_005.xhtml"/>
</navPoint>
<navPoint id="navPoint-5" playOrder="5">
<navLabel>
<text>LA FAMILIA</text>
</navLabel>
<content src="Text/index_split_006.xhtml"/>
</navPoint>
<navPoint id="navPoint-6" playOrder="6">
<navLabel>
<text>capitulo III</text>
</navLabel>
<content src="Text/index_split_007.xhtml"/>
</navPoint>
<navPoint id="navPoint-7" playOrder="7">
<navLabel>
<text>EL ACCIDENTE</text>
</navLabel>
<content src="Text/index_split_008.xhtml"/>
</navPoint>
<navPoint id="navPoint-8" playOrder="8">
<navLabel>
<text>capitulo IV</text>
</navLabel>
<content src="Text/index_split_009.xhtml"/>
</navPoint>
<navPoint id="navPoint-9" playOrder="9">
<navLabel>
<text>LA SEÑORITA ARUNDELL ESCRIBE UNA CARTA</text>
</navLabel>
<content src="Text/index_split_010.xhtml"/>
</navPoint>
<navPoint id="navPoint-10" playOrder="10">
<navLabel>
<text>capítulo V</text>
</navLabel>
<content src="Text/index_split_011.xhtml"/>
</navPoint>
<navPoint id="navPoint-11" playOrder="11">
<navLabel>
<text>HÉRCULES POIROT RECIBE UNA CARTA</text>
</navLabel>
<content src="Text/index_split_012.xhtml"/>
</navPoint>
<navPoint id="navPoint-12" playOrder="12">
<navLabel>
<text>capítulo VI</text>
</navLabel>
<content src="Text/index_split_013.xhtml"/>
</navPoint>
<navPoint id="navPoint-13" playOrder="13">
<navLabel>
<text>VISITAMOS LITTLEGREEN HOUSE</text>
</navLabel>
<content src="Text/index_split_014.xhtml"/>
</navPoint>
<navPoint id="navPoint-14" playOrder="14">
<navLabel>
<text>capítulo VII</text>
</navLabel>
<content src="Text/index_split_015.xhtml"/>
</navPoint>
<navPoint id="navPoint-15" playOrder="15">
<navLabel>
<text>COMEMOS EN «THE GEORGE»</text>
</navLabel>
<content src="Text/index_split_016.xhtml"/>
</navPoint>
<navPoint id="navPoint-16" playOrder="16">
<navLabel>
<text>capítulo VIII</text>
</navLabel>
<content src="Text/index_split_017.xhtml"/>
</navPoint>

It appears that toc.ncx it's being generated either with incorrect links (1st case) or with no links (this case) but it is quite peculiar since it gets fixed just with the saving that Sigil does

[kovidgoyal]

you need to use the toc detection options. Sigil is presumably auto generating a toc.