Editor TexShop引擎中配备Xeletex的knitr

我的资料来源，“bookTest.Rnw”：

控制台显示：

processing file: bookTest.Rnw

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  ordinary text without R code


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label: unnamed-chunk-1

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  ordinary text without R code


output file: bookTest.tex

[1] "bookTest.tex"
This is XeTeX, Version 3.14159265-2.6-0.999992 (TeX Live 2020) (preloaded format=xelatex)
 restricted \write18 enabled.
entering extended mode
(./bookTest.tex
LaTeX2e <2020-10-01> patch level 1
L3 programming layer <2020-10-05> xparse <2020-03-03>
! Argument of \@fileswith@pti@ns has an extra }.
<inserted text> 
                \par 
l.1 ...fte-book}\usepackage[]{graphicx}\usepackage
                                                  []{color}
? 

处理文件：bookTest.Rnw
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不带R码的普通文本
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标签：unnamed-chunk-1
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不带R码的普通文本
输出文件：bookTest.tex
[1] “bookTest.tex”
这是XeTeX，版本3.14159265-2.6-0.999992（TeX Live 2020）（预加载格式=xelatex）
受限\已启用写18。
进入扩展模式
（./bookTest.tex）
LaTeX2e修补程序级别1
L3编程层xparse
！论点\@fileswith@pti@ns有一个额外的}。
\标准杆
l、 1…fte book}\usepackage[]{graphicx}\usepackage
[]颜色}
? 

这是我能创建的最短MWE，希望“extra}”问题是由于引擎代码中的错误造成的

我正在MacOS 10.15.7上使用TexShop版本4.44

#!/bin/bash
export PATH=$PATH:/usr/texbin:/usr/local/bin
Rscript -e "library(knitr); knit('$1')"
xelatex "${1%.*}"

processing file: bookTest.Rnw

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  |                                                                      |   0%
  |                                                                            
  |.......................                                               |  33%
  ordinary text without R code


  |                                                                            
  |...............................................                       |  67%
label: unnamed-chunk-1

  |                                                                            
  |......................................................................| 100%
  ordinary text without R code


output file: bookTest.tex

[1] "bookTest.tex"
This is XeTeX, Version 3.14159265-2.6-0.999992 (TeX Live 2020) (preloaded format=xelatex)
 restricted \write18 enabled.
entering extended mode
(./bookTest.tex
LaTeX2e <2020-10-01> patch level 1
L3 programming layer <2020-10-05> xparse <2020-03-03>
! Argument of \@fileswith@pti@ns has an extra }.
<inserted text> 
                \par 
l.1 ...fte-book}\usepackage[]{graphicx}\usepackage
                                                  []{color}
?