我正在尝试设置在rMarkdown中创建的pdf文档的字体
---
title: "Intro"
date: "10/07/2020"
output:
pdf_document:
latex_engine: xelatex
mainfont: Arial
---
这不起作用。我收到以下错误
tlmgr.pl: Local TeX Live (2019) is older than remote repository (2020).
Cross release updates are only supported with
update-tlmgr-latest(.sh/.exe) --update
See https://tug.org/texlive/upgrade.html for details.
! LaTeX Error: File `unicode-math.sty' not found.
! Emergency stop.
<read *>
我在做什么错了？