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your repo gets cloned fresh in those log lines. try to submit a change and see if it still fails. It might be that there is something missing that comes after the error in the first run
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the following is the actuall error:
Error: "/opt/build/repo/themes/hugo-academic/layouts/partials/book_sidebar.html:24:1": parse failed: template: partials/book_sidebar.html:24: illegal number syntax: "-"
Check that file on line 24 and see what happens there. Post it here. That might require a fix.