internal link does not resolve

Hello,

How can I "debug" errors like:

In pattern count(//dtbk:*[@id=substring(current()/@href, 2)])=1:
internal link does not resolve

There are not hyperlinks in the document. What does actually that error mean?

Thank you,
Gerasimos

Sometimes the hyperlinks are in the footnotes/endnotes and easily skip our inspection. If you send the document to me I will be happy to detect and fix the error. My email ID is pverma[at the rate]daisy.or