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Check all links in the text. There could be one with a mispelling or capitalization problem like mrmikel mentioned.
Usually, it's a link to file that just doesn't exist in the epub. Focus on the html toc and/or the toc.ncx first. That's where the most links usually are. Then expand outward to things like footnote links, header links (back to the html toc), and any other links that may or may not be included in the text of your book.
If all else fails, search for "href=" with Find & Replace, and verify each and every occurence.
There may be a Sigil Report that helps with links as well (I'm away from Sigil and can't remember for sure).
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