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In Sigil, double click on an error and Sigil should take you to the file and line with the error.
A fragment is the part of a url which may appear at the end that starts with # and the remainder of the string points to the id attribute value it should go to in that url.
Some of your links have fragements but no where in the destination file is there an element with an id attribute value specified in the fragment.
Once you fix all those, rerun epubcheck, then use Sigil to delete the toc.ncx file and retry.
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