编译后出现Undefined control sequence. l.7 \ctexset，请问怎么解决？

windows10 texlive2021 texstudio xelatex

%导言区
documentclass{book}

usepackage{ctex}

%正文区(文稿区)

%======设置标题的格式======
ctexset{

section = {
    format+ = \zihao{-4} \heiti \raggedright,
    name = {，、},
    number = \chinese{section},
    beforeskip = 1.0ex plus 0.2ex minus .2ex,
    afterskip = 1.0ex plus 0.2ex minus .2ex,
    aftername = \hspace{0pt}
},
subsection = {
    format+ = \zihao{5} \heiti \raggedright,
    % name={\thesubsection、},
    name = {，、},
    number = \arabic{subsection}
    beforeskip = 1.0ex plus 0.2ex minus .2ex,
    afterskip = 1.0ex plus 0.2ex minus .2ex,
    aftername = \hspace{0pt}
}

}

begin{document}

\tableofcontents

\chapter{绪论}
\section{研究的目的和意义}
\section{国内外研究现状}
\subsection{国外研究现状}
\subsection{国内研究现状}
\section{研究内容}
\section{研究方法与技术路线}
\subsection{研究内容}
\subsection{技术路线}

\chapter{实验与结果分析}
\section{引言}
\section{实验方法}
\section{实验结果}
\subsection{数据}
\subsection{图表}
\subsubsection{实验条件}
\subsubsection{实验过程}
\subsection{结果分析}
\section{结论}
\section{致谢}

end{document}

@u50882 我更新了回答

@u3793 您好，我复制了您的代码，编译后报错如下

行 13: Unknown option heading=true' for package ctex'.
行 8: Undefined control sequence. ctexset
行 9: Missing begin{document}. ^^Is
行 11: Undefined control sequence. ^^I^^Iname = { ,、
行 11: Undefined control sequence. ^^I^^Iname = { ,、
行 11: Undefined control sequence. ^^I^^Iname = { ,、
行 11: Undefined control sequence. ^^I^^Iname = { ,、
行 11: Undefined control sequence. ^^I^^Iname = { ,、
行 11: Undefined control sequence. ^^I^^Iname = { ,、
行 12: Undefined control sequence. ^^I^^Inumber = chinese{section}
行 12: Undefined control sequence. ^^I^^Inumber = chinese{section}
: You have requested package savesym', but the package provides savesymbol'.
: No file 4.toc.
行 41: Font shape EU1/SimSun(0)/m/sl' undefined(Font) using EU1/SimSun(0)/m/n' instead
: Some font shapes were not available, defaults substituted.

@u50882 emmm，你把代码中所有的缩进重新用空格打一遍，或者直接不要缩进

@u50882 或者我在代码上给了你修改意见，你直接按照意见修改你自己的代码也可以

@u3793 还是不行，我放弃了，非常感谢您的回答！