When the R language output rmarkdown is in other formats (such as PDF), an error is reported, latex failed to compile stocks Tex. solution

（ One ） Not installed Tinytex The packet causes an error

In the use of R Language output R Markdown For other formats , Sometimes the following error reports appear

LaTeX failed to compile stocks.tex. See https://yihui.org/tinytex/r/#debugging for debugging tips. See Untitled.log for more info.
In addition: Warning message:
In system2(..., stdout = if (use_file_stdout()) f1 else FALSE, stderr = f2) :
error in running command
Execution halted

meanwhile , Sometimes the following error will be reported that a package is not found , Such as '"tlmgr"' not found、‘"pdflatex"' not found etc. .
Now open https://yihui.org/tinytex/r/#debugging for debugging, According to the guidelines , You can do that ：

1. First installation tinytex package （ In the picture above Console Inside , Any of the following three sentences can ）

   install.packages('tinytex')
   tinytex::install_tinytex()
   remotes::install_github('yihui/tinytex')
   

2. Try to output again , If you still cannot output , Can follow https://yihui.org/tinytex/r/#debugging for debugging The following steps are given （ After each step, you can try whether it can be output smoothly ）：
   Reinstall all packages

   update.packages(ask = FALSE, checkBuilt = TRUE)
   tinytex::tlmgr_update()
   

3. If you make a mistake ：tlmgr: Remote repository is newer than local, reinstall tinytex

   tinytex::reinstall_tinytex()
   

   Be sure to run first 1. The code inside ！ If you run this line of code at the beginning , The following error will be reported ：

   # The first category 
   tlmgr update --all --self
   Error in system2("tlmgr", args, ...) : '"tlmgr"' not found
   # The second category 
   package ‘TLMGR’ is not available for this version of R
   # wait 
   

4. stay R Markdown Add the following words to the document ：

   {
         r, include=FALSE}
   options(tinytex.verbose = TRUE)
   

（ Two ）Rmd It can be output in other formats , Cannot output as PDF：

At this time, the following error will be reported ：

! Package inputenc Error: Unicode character ?(U+6CF0)
(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 a.tex. See https://yihui.name/tinytex/r/#debugging for debugging tips. See a.log for more info.
 Besides : Warning message:
In grepl("==> Fatal error occurred", x[i], fixed = TRUE) :
 String entered 1 Not applicable to this locale 
 Stop executing 

1. Click Settings button, choice output options.
   
2. Output Choose as PDF Then click Advanced
3. change LaTeX engine by xelatex Then click OK
   
   You can also directly add the following code to the file header and output .

output: 
  pdf_document: 
    latex_engine: xelatex

source ：https://stackoverflow.com/questions/32794157/package-inputenc-error-unicode-char-u8-in-rstudio
If you have any other questions, please comment and discuss ~