如何在R中编织到PDF

我不明白为什么我在尝试编织pdf时会出现这个错误。在以前的作业中，我能够编织到pdf，所以我不明白这一个有什么问题

Output file: Edith_HW2.knit.md

! Package inputenc Error: Unicode character ̣ (U+0323)
(inputenc)                not set up for use with LaTeX.

Try other LaTeX engines instead (e.g., xelatex) if you are using pdflatex. For R Markdown users, see https://bookdown.org/yihui/rmarkdown/pdf-document.html
Error: Failed to compile Edith_HW2.tex. See https://yihui.name/tinytex/r/#debugging for debugging tips. See Edith_HW2.log for more info.
Execution halted

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您的文档似乎包含LaTeX无法处理的unicode字符“̣”`（U+0323）。尝试将其替换为

\d{}

。如何识别“unicode”字符？我需要在哪里放置“\d{}”谢谢