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What OS? What version of Sigil? Where did you download it? How did you save it?
Are you sure you properly created and added other chapters? How did you add them? Where (what app) did they originate from?
Did you manually edit or play with the content.opf file?
Have you tried copying the epub and changing its file extension to .zip and unzipping it to see if the files are actually inside the sip?
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