Error rendering PDF manuscript using the template of svm-article2-example.Rmd

[zhanglantian2021]

I just want to knit the template file and check what doest it look like in pdf. And the point is that I didn't change anything, but the output reminded me that I missed something....

This is XeTeX, Version 3.141592653-2.6-0.999994 (TeX Live 2022) (preloaded format=xelatex)
 restricted \write18 enabled.

entering extended mode

I was unable to find any missing LaTeX packages from the error log svm-article2-example.log.

! LaTeX Error: Missing \begin{document}.


Error: LaTeX failed to compile svm-article2-example.tex. See https://yihui.org/tinytex/r/#debugging for debugging tips. See svm-article2-example.log for more info.

Execution halted

[VSC-R] svm-article2-example.Rmd process exited with exit code 1
[VSC-R] terminating R process