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I have no idea why the following MWE should have errors. I would really appreciate it if you could help.
\documentclass{article}
\usepackage{color,soul}
\begin{document}
\hl{used the Monte Carlo simulation to explore different staffing policies and minimize infections among SMs on non–COVID-19 wards. They reported that longer nursing shifts and less co-rotation of SMs (no more frequently than every three days) may lead to fewer infections.}
\end{document}
Your text includes a non-ascii dash, the original soul package can not cope use soulutf8 instead.
\documentclass{article}
\usepackage{color,soulutf8}
\begin{document}
\hl{used the Monte Carlo simulation to explore different staffing policies
and minimize infections among SMs on non–COVID-19 wards. They reported
that longer nursing shifts and less co-rotation of SMs (no more frequently
than every three days) may lead to fewer infections.}
\end{document}
That said, it is far more conventional to use a hyphen - rather than an en-dash – after non so is this dash really intended here?
