LaTeX编译失败

Question

我无法在r markdown上编织PDF。错误消息表明LaTeX无法编译。我正在使用Mac电脑。我更新了LaTeX，R markdown和R Studio。有谁知道发生了什么事吗？

这是错误消息，

"output file: Untitled.knit.md

! Emergency stop.
<*> Untitled.tex

Error: LaTeX failed to compile Untitled.tex. See https://yihui.org/tinytex/r/#debugging for             debugging tips. See Untitled.log for more info.
Execution halted "

此外，这是日志文件消息，

"This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020) (preloaded format=pdflatex 
2020.6.25)  25 JUN 2020 04:48
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**Untitled.tex
(./Untitled.tex
LaTeX2e <2020-02-02> patch level 5
L3 programming layer <2020-06-18>)
! Emergency stop.
<*> Untitled.tex
             
Here is how much of TeX's memory you used:
 16 strings out of 482394
 386 string characters out of 5945893
 234434 words of memory out of 5000000
 15910 multiletter control sequences out of 15000+600000
 532338 words of font info for 24 fonts, out of 8000000 for 9000
 14 hyphenation exceptions out of 8191
 12i,0n,15p,44b,8s stack positions out of 5000i,500n,10000p,200000b,80000s

!  ==> Fatal error occurred, no output PDF file produced!"