我没有将 inputenc 写入两次。至少我的主要 tex 文件中没有它。我不确定是什么导致了这个错误，并且可以使用一些帮助来对其进行故障排除。
这是我在文档开始之前写的所有内容：
% -----------------------------------Initialize Document----------------------------------------
\documentclass[12pt]{article}
\usepackage{textcomp}
\usepackage[headheight=12pt, headsep=0pt, nohead, nofoot]{geometry}
\usepackage{graphicx}
\usepackage{subcaption}
\usepackage{subfig}
\usepackage{multicol}
\usepackage{siunitx}
\usepackage{wrapfig}
\usepackage{amsmath}
\usepackage[colorlinks]{hyperref}
\usepackage[utf8]{inputenc}
\usepackage{lipsum}
\setlength{\footskip}{40pt}
\DeclareSIUnit\gauss{G}
\input{style/common.tex}
\input{style/scala.tex}
\lstset{frame=, basicstyle={\footnotesize\ttfamily}}
\graphicspath{ {images/} }
%-----------------------------------------Cover Page----------------------------------------
这是我得到的错误：
LaTeX Error: Option clash for package inputenc.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.2 \usepackage
[british,UKenglish]{babel}
The package inputenc has already been loaded with options:
[utf8]
There has now been an attempt to load it with options
[utf8x]
Adding the global options:
utf8,utf8x
to your \documentclass declaration may fix this.
Try typing <return> to proceed.
(/usr/share/texlive/texmf-dist/tex/generic/babel/babel.sty
Package: babel 2016/04/23 3.9r The Babel package
(/usr/share/texlive/texmf-dist/tex/generic/babel-english/english.ldf
Language: english 2012/08/20 v3.3p English support from the babel system
(/usr/share/texlive/texmf-dist/tex/generic/babel/babel.def
File: babel.def 2016/04/23 3.9r Babel common definitions
\babel@savecnt=\count173
\U@D=\dimen190
)
\l@canadian = a dialect from \language\l@american
\l@australian = a dialect from \language\l@british
\l@newzealand = a dialect from \language\l@british
) (/usr/share/texlive/texmf-dist/tex/generic/babel-english/english.ldf
Language: english 2012/08/20 v3.3p English support from the babel system
)) (/usr/share/texlive/texmf-dist/tex/latex/graphics/color.sty
Package: color 2016/07/10 v1.1e Standard LaTeX Color (DPC)
(/usr/share/texlive/texmf-dist/tex/latex/graphics-cfg/color.cfg
File: color.cfg 2016/01/02 v1.6 sample color configuration
)
Package color Info: Driver file: pdftex.def on input line 147.
) (/usr/share/texlive/texmf-dist/tex/latex/fancyref/fancyref.sty
Package: fancyref 1999/02/03 v0.9c Fancy cross-referencing
(/usr/share/texlive/texmf-dist/tex/latex/tools/varioref.sty
Package: varioref 2016/02/16 v1.5c package for extended references (FMi)
\c@vrcnt=\count174
)) (/usr/share/texlive/texmf-dist/tex/latex/float/float.sty
Package: float 2001/11/08 v1.3d Float enhancements (AL)
\c@float@type=\count175
\float@exts=\toks25
\float@box=\box78
\@float@everytoks=\toks26
\@floatcapt=\box79
) (/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrextend.sty
Package: scrextend 2016/06/14 v3.21 KOMA-Script package (extend other classes with features of KOMA-Script classes)
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrkbase.sty
Package: scrkbase 2016/06/14 v3.21 KOMA-Script package (KOMA-Script-dependent basics and keyval usage)
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrbase.sty
Package: scrbase 2016/06/14 v3.21 KOMA-Script package (KOMA-Script-independent basics and keyval usage)
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrlfile.sty
Package: scrlfile 2016/06/14 v3.21 KOMA-Script package (loading files)
Package scrlfile, 2016/06/14 v3.21 KOMA-Script package (loading files)
Copyright (C) Markus Kohm
所以我把范围缩小到这一行。回滚到项目运行时并慢慢添加回更改后，这一行导致代码无法编译。
% -----------------------------------Initialize Document----------------------------------------
\documentclass[12pt]{article}
\usepackage{textcomp}
\usepackage[headheight=12pt, headsep=0pt, nohead, nofoot]{geometry}
\usepackage{graphicx}
\usepackage{subcaption}
\usepackage{subfig}
\usepackage{multicol}
\usepackage{siunitx}
\usepackage{wrapfig}
\usepackage{hyperref}
\usepackage{amsmath}
\usepackage[colorlinks]{hyperref}
\usepackage[utf8]{inputenc}
\usepackage{lipsum}
\setlength{\footskip}{40pt}
\DeclareSIUnit\gauss{G}
\input{style/common.tex}
\input{style/scala.tex}
\lstset{frame=, basicstyle={\footnotesize\ttfamily}}
\graphicspath{ {images/} }
%-----------------------------------------Cover Page----------------------------------------
\begin{document}
%-----------------------------------------ABSTRACT-------------------------------------
\begin{center}
{\large\bf{Abstract}}
\end{center}
\begin{enumerate}
%this line
\item click on "\textbf{\textit{Manage Passwords}".
\end{enumerate}
\end{document}
答案1
您的文档代码存在几个常见问题：
加载
hyperref包最后的。 有很少此规则有例外。（cleveref包是这些例外之一：它必须在之后加载hyperref。）不要同时加载
subfig和subcaption。它们不兼容。只能选择其中一个，但并非两者兼而有之。指令
\lstset{frame=, basicstyle={\footnotesize\ttfamily}是错误的。除了必须加载
listings包（您的代码无法做到这一点）才能激活\lstset宏之外，指令应该是\lstset{frame=, basicstyle={\footnotesize\ttfamily}}才能正常工作。你能发现不同之处吗？
不要
\bf在 LaTeX 文档中使用 Plain-TeX 指令。请\bfseries改用。不要不必要地使用
{and}—— 这只会造成代码混乱。因此，\begin{center} {\large\bf{Abstract}} \end{center}写吧
\begin{center} \large\bf Abstract \end{center}或者更好的是，
\begin{center} \large\bfseries Abstract \end{center}请检查是否确实需要加载所有这些包。我总觉得有些包的加载毫无理由。
实施上述建议后，将获得以下结果：
\documentclass[12pt]{article}
\usepackage[utf8]{inputenc} % it's usually a good idea to load this package early
\usepackage{textcomp}
\usepackage[headheight=12pt, headsep=0pt, nohead, nofoot]{geometry}
\usepackage{graphicx}
\usepackage{subcaption}
%\usepackage{subfig}
\usepackage{multicol}
\usepackage{siunitx}
\DeclareSIUnit\gauss{G}
\usepackage{wrapfig}
\usepackage{amsmath}
\usepackage{lipsum} % filler text
\setlength{\footskip}{40pt} % why??
% Commented out since I don't have the files 'common.tex' and 'scala.tex':
%\input{style/common.tex}
%\input{style/scala.tex}
\usepackage{listings} % previously missing
\lstset{frame=, basicstyle={\footnotesize\ttfamily}}
\graphicspath{ {images/} }
\usepackage[colorlinks]{hyperref} % load this package LAST
\begin{document}
%--------------------------ABSTRACT---------------------
\begin{center}
\large\bfseries Abstract
\end{center}
\begin{enumerate}
\item Click on ``\textbf{\textit{Manage Passwords}}''
\end{enumerate}
\end{document}