未定义的控制序列“\end{frame}”

Question

我是 Latex 的新手，我在行尾 \end{frame} 看到错误，无法弄清楚为什么？

\documentclass{beamer}
% --------------------------------------------------- %
%                  Presentation info                  %
% --------------------------------------------------- %
\title{Test1}
\author{AMITH KOTIAN}
\date{January 2021}

\begin{document}

\maketitle

\section{Introduction}
   \begin{frame}{HAND REHABILITATION SYSTEM}
    \chaptype{ \LARGE \textbf {1.Design Consideration}}
        \vspace*{0.5cm}
        \begin{itemize}
        \setlength{\itemsep}{3mm}
            \begin{Large}
            \item User safety must be guaranteed.
            \item It can be easily worn.
           \end{Large}
      \end{itemize}
    \end{frame}

\end{document}

Answer 1

宏 \chaptype 未定义。我不知道你可能想要它做什么，但你必须加载一个定义它的包或自己定义它：

\documentclass{beamer}
% --------------------------------------------------- %
%                  Presentation info                  %
% --------------------------------------------------- %
\title{Test1}
\author{AMITH KOTIAN}
\date{January 2021}

\newcommand{\chaptype}[1]{{#1}}

\begin{document}

\maketitle

\section{Introduction}
   \begin{frame}{HAND REHABILITATION SYSTEM}
    \chaptype{ \LARGE \textbf {1.Design Consideration}}
        \vspace*{0.5cm}
        \begin{itemize}
        \setlength{\itemsep}{3mm}
            \begin{Large}
            \item User safety must be guaranteed.
            \item It can be easily worn.
           \end{Large}
      \end{itemize}
    \end{frame}

\end{document}

未定义的控制序列“\end{frame}”

Undefined control sequence "\end{frame}"

latex

tex

pdflatex