Undefined control sequence當我用來\hyperref引用所需的部分時，出現錯誤。我想讓節號指當我單擊它時的節，同時我希望節號自動顯示為 \ref 。像這樣：
\documentclass{article}
\usepackage{harvard}
\usepackage{xcolor}
\usepackage{graphicx}
\usepackage{url}
\usepackage{hyperref}
\usepackage{xspace}
\renewcommand{\harvardurl}{URL:\url}
\graphicspath{./301/Alaa Ali Yousef/}
\title {Example \LaTeX \quad article for course 4ME301}
\author{Alaa Ali Yousef \\ 9105195789 \\[email protected]\\ Linnaeus University, Växjö }
\begin{document}
\maketitle
\begin{abstract}
This assignment aims to make you familiar with the basic features
of \LaTeX which should come useful when preparing your own reports,
and eventually your master thesis. You should try to replicate “as
close as possible” this PDF document using \LaTeX. This does not
exclude making some changes as long as they are relevant. Submission
instructions can be found in Section \ref{secondSection}.
\end{abstract}
\section{Introduction section}
\label{firstsection}
There is a handy book about \LaTeX {\color{green}\cite{lamport1994latex}} available at the LNU library, but if
you search online you should find many examples and guides, like e.g. {\color{green}\cite{WEBSITE:2}}
on {\color{green}\cite{WEBSITE:3}}, or extensive information on {\color{green}\cite{WEBSITE:1}}.
\section{How to submit}
\label{secondSection}
\
When you compose and compile the final version of this document, you should upload a .zip file on the course moodle that contains:
\begin{enumerate}
\item the compiled .pdf file;
\item the source files (.tex, .bib, and the image file).
\end{enumerate}
The filename template for these files, besides the image file, should be:
\begin{itemize}
\item 4ME301-LaTeX-[yoursurname].xxx
\end{itemize}
\end{document}
我該如何使用 \ref 和 \hyperref 或 \hyperlink 使節的編號可點擊，哪些更適合使用 \hyperref 或 \hyperlink？
我使用了它們並得到了相同的錯誤