Bookdown: error: Failed to compile bookdown-demo.tex.

Error: Message:
Error: Failed to compile bookdown-demo.tex.
Warning messages:
1: running command '"xelatex" -halt-on-error -interaction=batchmode "bookdown-demo.tex"' had status 127
2: running command '"xelatex" -halt-on-error -interaction=batchmode "bookdown-demo.tex"' had status 127
3: running command '"xelatex" -halt-on-error -interaction=batchmode "bookdown-demo.tex"' had status 127

Reasons:
This is because I didn't install XeLaTeX

How to solve:

* Install XeLaTeX on Windows

Weblink: http://www.texts.io/support/0002/

* Restart the Rstudio

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