使用 \includegraphics 插入图像时，“段落在 \Gin@iii 完成之前结束”

Question

我正在尝试使用以下语法将图形插入到我的 LaTeX 文件中：

\begin{figure}
  \centering
  \includegraphics [width=3in]{fig1.png}
  \caption{Calculation of shortest path betweenness}
  \label{Fig.3:Shortest path betweenness}
\end{figure}

以前我这样做是可行的，但这次我收到以下错误：

 LaTeX Error: \begin{figure} on input line xxx ended by \end{document}

另外，将鼠标悬停在 Eclipse 中表示错误的红十字符号上，我看到了此消息

 paragraph ended before Gin@iii was completed.

很明显，我必须\end{figure}结束我的\begin{figure}，所以我不明白为什么我仍然会收到那个错误。

有人能告诉我问题出在哪里吗？

编辑：添加更多调试细节。如果我删除“[width=3in]”，问题就消失了。以下是详细错误：

pdflatex> Runaway argument?
pdflatex> width=3in]{fig1.png} \caption {Caption} \label {Fig.1} 
pdflatex> ! Paragraph ended before \Gin@iii was complete.
pdflatex> <to be read again> 
pdflatex>                    \par 
pdflatex> l.40 
pdflatex>       
pdflatex> 
pdflatex> Underfull \vbox (badness 10000) has occurred while \output is active
pdflatex> (./document.bbl
pdflatex> 
pdflatex> Package natbib Warning: Empty `thebibliography' environment on input line 3.

添加了示例代码：

\documentclass[10pt,psfig,letterpaper,twocolumn]{article}
\usepackage{geometry}
\usepackage{graphics}
\usepackage{setspace}
\usepackage{natbib}
\usepackage{verbatim}
\usepackage[scaled=0.9]{helvet}
\singlespacing
\paperwidth 8.5in
\paperheight 11in
\oddsidemargin 0in
\headsep 1.3cm 
\geometry{left=0.75in,top=0.75in,right=0.75in,bottom=1in}
\textwidth 7in 
\textheight 9.25in
\columnsep 0.4in
\footskip 0in 
\renewcommand{\bibname}{REFERENCE}
\pagestyle{empty} 
\begin{document}
\bibliographystyle{acm} 

\title{\fontfamily{phv}\selectfont{\huge{\bfseries{Title here}}}} \author{
{\fontfamily{ptm}\selectfont{\large{\bfseries{author name}}}}\thanks{contact
info }}

\maketitle
\thispagestyle{empty}

\section*{\fontfamily{phv}\selectfont{\normalsize{\bfseries{Section name}}}}

\begin{figure}
\centering
\includegraphics[width=3in]{fig1.png}
\caption{Caption}
\label{Fig.1}
\end{figure}

\pagebreak[4]
\vspace*{5.52in}
\bibliography{ref}
\end{document}

Answer 1

问题似乎在于你加载

\usepackage{graphics}

代替

\usepackage{graphicx}

只有使用后一种声明，您才可以使用语法

\includegraphics[width=3in]{fig1.png}