Question

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$75( \sqrt{125 + 258 \times 175 \frac{12 \div 2}{25} } )$
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Answer 1

Step-by-step explanation:

So on the next run, try pressing 2 at the error prompt, which tells latex to ignore the problem, and continue, instead of trying to fix it. In doing so, it'll print out the last bit of text it read (near the problem), and that should give you a clue where the problem is (you might need to do this a couple of times).

Turns out my problem was on line 366 of my .bib file, and no-where near line 20 as reported. It was caused by a ~ in a url that hadn't been converted by the zotero exporter. Deleting that line removed the error.