I've had a strange error message on 2 different files now when using the epubcheck plugin, if I check the same files with epubcheck outside of Sigil they validate and it seems unrelated to the file. Any idea what is causing it and how to fix / avoid it?
The error message says "Internal error. bk.href_to_id()failed for:" and then there is what looks like a temporary file name which is different each time.
See attached screenshots for examples.
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