\xdef\@fontenc@load@list{\@fontenc@load@list undefined control sequence in Rmarkdown
问题 I've tried to write a very simple Rmarkdown file to render as pdf, but got an error for an undefined control sequence . The file: --- title: "Untitled" author: "author" date: "3/2/2020" output: pdf_document --- # whatever fskjflsjflkj saved as test.Rmd and knit (with the button) produces the following output in the R markdown console: processing file: test.Rmd output file: test.knit.md ! Undefined control sequence. l.115 \xdef\@fontenc@load@list{\@fontenc@load@list Error: LaTeX failed to