Did you change something after you generated the inline (HTML) TOC?
A fragment is the #name of a link (includes chapter heads)
The name implies these were all Sigil Generated HTML TOC (anchors) entries at one time.
So look at those named files.
Now it could be that SW is complaining about an anchor that has no use. This is not a ERROR (it could be considered a warning) in reality (just excess baggage)
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