A fragment identifier is the portion at the end of the url that begins/follows the #
It indicates where (which tag with that id attribute) to move to.
In your example, the url for Chapter One is looking in the file ch1.xhtml for a tag with id="chapter01".
Similar for the other urls.
The error means there is no tag with id="chapter01" in ch1.xhtml.
To fix this you could add id="chapter01" in a tag in ch1.xhtml that you want that link url to move to.
Alternatively if that link should go to the top of ch1.xhtml, then you can just edit the url in the toc to remove the #chapter01 from the end of the url as it is unneeded.
Ditto for the others.
Last edited by KevinH; 06-27-2023 at 03:40 PM.
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