Получил ошибку: выходной файл: app2.knit.md
This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019/W32TeX) (preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
! Missing number, treated as zero.
<to be read again>
\protect
l.105 ...nter}\rule{0.5\linewidth}{\linethickness}
\end{center}
ERROR: Failed to compile app2.tex. See https://yihui.name/tinytex/r/#debugging for debugging tips. See app2.log for more info.
Debugging stopped
Warnings:
In '(function (e) ': You have a leaked pooled object.
Knit to HTML работает нормально, но PDF - нет. Что я должен делать?