我的文档中有两个表格，但编译时出现错误消息
出了点问题——可能缺少 \item。\end{tabularx}
编译仅包含一个表的文档时没有问题。编译包含两个表的文档时出现错误消息，但我可以看到两个表。
看起来enumerate可能会引起问题。我尝试遵循以下建议：TEX 链接但没有成功。
有人可以建议一种解决该错误的方法吗？
梅威瑟：
\documentclass[a4paper,12pt]{article}
\usepackage{color}
\usepackage{graphicx, epstopdf}
\usepackage[british]{babel}
%\usepackage{gensymb}
\usepackage[section]{placeins}%Allows you to permanently fix figures.
\usepackage{titleps}%fancy page borders?
\usepackage[left=2.5cm, right=2.5cm, top=3.5cm, bottom=3.5cm]{geometry}%this changes the page geometry i.e. margins left, right, top and bottom
%\usepackage{caption}
\usepackage{microtype}
\usepackage{setspace}
\usepackage{amsmath}
\usepackage{SIunits}
\usepackage{mathptmx}
\usepackage{tabularx}
\usepackage{booktabs,caption, makecell}
\usepackage{pdflscape,afterpage}
\onehalfspacing
\usepackage{geometry}
\usepackage{booktabs, makecell, ltablex}
\usepackage{caption}
\renewcommand\theadfont{\small\bfseries}
\renewcommand\tabularxcolumn[1]{m{#1}}
\usepackage[usestackEOL]{stackengine}
\usepackage[table]{xcolor}
\usepackage{pdflscape,afterpage}
\usepackage{enumitem} % <--- added
\usepackage{etoolbox} % <--- added
\AtBeginEnvironment{table}{%
\setlist[enumerate]{nosep, % <--- added
topsep = 0pt,
partopsep = 0pt,
leftmargin = * ,
before = \vspace{-0.6\baselineskip},
after = \vspace{-\baselineskip}
}}
\begin{document}
\begin{table}[ht]
\caption{Cognitive walkthrough goals, tasks and actions}
\label{table:comparison of techniques}
\small
\begin{tabularx}{\linewidth}{@{}
X
>{\centering\arraybackslash}X % content of `X` column is now centered
X
@{}}
\toprule
\thead{\textbf{Goal}}& \thead{\textbf{Task}} & \thead{\textbf{Action}} \\
\midrule
Evaluate the ease in which users can join projects
& Access and account set up
& \begin{enumerate}
\item Teast A: Video provides a powerful way to help you prove your point.
Test B: Video provides a powerful way to help you prove your point.
\item Video provides a powerful way to help you prove your point.
\end{enumerate} \\
\addlinespace
Evaluate the ease in learning to map
& Learning how to map
& Read tutorial \\
\addlinespace
Contribute data
& Contributing data by classifying maps
& \begin{enumerate}
\item Video provides a powerful way to help you prove your point.
\item Test A: Video provides a powerful way to help you prove your point.
Test B: Video provides a powerful way to help you prove your point.
\item Video provides a powerful way to help you prove your point.
\end{enumerate} \\
\addlinespace
Evaluate if the user likes using the application and whether they like using it
& -- & -- \\
\bottomrule
\end{tabularx}%
\end{table}
\begin{landscape}% Landscape page
\small
\setlength\extrarowheight{2pt}
\begin{tabularx}{\linewidth}{
>{\columncolor{red!30}} l
*{3}{X}X@{}
}\caption{}
%\label{table:comparison of techniques}
\\
\Xhline{1pt}
\multicolumn{1}{c}{\cellcolor{red!30}}
&\bfseries{Is the effect of the current action the same as the user's goals?}{\cellcolor{red!30}} &\bfseries{Is the action visible?}{\cellcolor{red!30}}
& \bfseries{Will the user recognise the action as the right one?}{\cellcolor{red!30}} &\multicolumn{1}{>{\columncolor{red!30}[6pt][0pt]\bfseries}c@{}}{\Centerstack{Will the user understand \\ the feedback?}} \\
\Xhline{0.25pt}
\endfirsthead
\Xhline{1pt}
% \rowcolor{red!30}
\multicolumn{1}{c}{\cellcolor{red!30}}
&\bfseries{Is the effect of the current action the same as the user's goals?} &\bfseries{Is the action visible?}
& \bfseries{Will the user recognise the action as the right one?} &\multicolumn{1}{>{\bfseries}c@{}}{\Centerstack{Will the user understand \\ the feedback?}} \\
\Xhline{0.25pt}
\endhead
\Xhline{0.25pt}
\endfoot
\Xhline{1pt}
\endlastfoot
\rowcolor{black}
\multicolumn{5}{l}{\textcolor{white}{\bfseries Task 1 - access and account set up}} \\
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\Xhline{0.25pt}
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\rowcolor{black}
\multicolumn{5}{l}{\textcolor{white}{\bfseries Task 2 - learning how to map}} \\*
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\rowcolor{black}
\multicolumn{5}{l}{\textcolor{white}{\bfseries Task 3 - contributing data by classifying maps}} \\
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\Xhline{0.25pt}
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\Xhline{0.25pt}
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\end{tabularx}%
\end{landscape}
\end{document}
提前致谢！
答案1
事实证明，我最初的诊断是将X列归咎于未采用，enumerate这是不正确的。问题出在ltablex包上，解决方案是发出其指令\keepXColumns。以下文档是演示问题的最小文档；如果没有\keepXColumns宏，它会产生您报告的缺失\item错误，而使用宏，它可以很好地编译。
\documentclass{article}
\usepackage{ltablex}
\keepXColumns
\begin{document}
\begin{tabularx}{.9\textwidth}{X}
\begin{enumerate}
\item Test.
\item Test.
\end{enumerate}
\end{tabularx}
\end{document}
如果没有\keepXColumns，如果空间足够，包ltablex会尝试将X列转换为列。这需要包运行一些试验代码，而这些代码与单元中的环境l不太匹配。enumerate
添加\keepXColumns到您发布的代码中可以让它编译良好。但是，您的代码包含许多加载两次的包，并且比需要的长。这是一个较短的版本：
\documentclass[a4paper,12pt]{article}
\usepackage[main=british]{babel}
\usepackage{graphicx}
\usepackage[table]{xcolor}
\usepackage[section]{placeins}
\usepackage[left=2.5cm, right=2.5cm, top=3.5cm, bottom=3.5cm]{geometry}
\usepackage{titleps,microtype,setspace,amsmath,SIunits,tabularx}
\usepackage{mathptmx}
\usepackage{booktabs,caption,makecell,ltablex}
\usepackage{pdflscape,afterpage}
\onehalfspacing
\renewcommand\theadfont{\small\bfseries}
\renewcommand\tabularxcolumn[1]{m{#1}}
\usepackage[usestackEOL]{stackengine}
\usepackage{enumitem}
\usepackage{etoolbox}
\AtBeginEnvironment{table}{%
\setlist[enumerate]{nosep,
topsep = 0pt,
partopsep = 0pt,
leftmargin = *,
before = \vspace{-0.6\baselineskip},
after = \vspace{-\baselineskip}
}}
\keepXColumns
\begin{document}
\begin{table}[ht]
\caption{Cognitive walkthrough goals, tasks and actions}
\label{table:comparison of techniques}
\small
\begin{tabularx}{\linewidth}{@{}
X
>{\centering\arraybackslash}X % content of `X` column is now centered
X
@{}}
\toprule
\thead{\textbf{Goal}}& \thead{\textbf{Task}} & \thead{\textbf{Action}} \\
\midrule
Evaluate the ease in which users can join projects
& Access and account set up
& \begin{enumerate}
\item Teast A: Video provides a powerful way to help you prove your point.
Test B: Video provides a powerful way to help you prove your point.
\item Video provides a powerful way to help you prove your point.
\end{enumerate} \\
\addlinespace
Evaluate the ease in learning to map
& Learning how to map
& Read tutorial \\
\addlinespace
Contribute data
& Contributing data by classifying maps
& \begin{enumerate}
\item Video provides a powerful way to help you prove your point.
\item Test A: Video provides a powerful way to help you prove your point.
Test B: Video provides a powerful way to help you prove your point.
\item Video provides a powerful way to help you prove your point.
\end{enumerate} \\
\addlinespace
Evaluate if the user likes using the application and whether they like using it
& -- & -- \\
\bottomrule
\end{tabularx}
\end{table}
\begin{landscape}% Landscape page
\small
\setlength\extrarowheight{2pt}
\begin{tabularx}{\linewidth}{
>{\columncolor{red!30}} l
*{3}{X}X@{}
}\caption{}
% \label{table:comparison of techniques}
\\
\Xhline{1pt}
\multicolumn{1}{c}{\cellcolor{red!30}}
&\bfseries{Is the effect of the current action the same as the
user's goals?}{\cellcolor{red!30}} &\bfseries{Is the action
visible?}{\cellcolor{red!30}}
& \bfseries{Will the user recognise the action as the right
one?}{\cellcolor{red!30}}
&\multicolumn{1}{>{\columncolor{red!30}[6pt][0pt]\bfseries}c@{}}{\Centerstack{Will
the user understand \\ the feedback?}} \\
\Xhline{0.25pt}
\endfirsthead
\Xhline{1pt}
% \rowcolor{red!30}
\multicolumn{1}{c}{\cellcolor{red!30}}
&\bfseries{Is the effect of the current action the same as the
user's goals?} &\bfseries{Is the action visible?}
& \bfseries{Will the user recognise the action as the right one?}
&\multicolumn{1}{>{\bfseries}c@{}}{\Centerstack{Will the user
understand \\ the feedback?}} \\
\Xhline{0.25pt}
\endhead
\Xhline{0.25pt}
\endfoot
\Xhline{1pt}
\endlastfoot
\rowcolor{black}
\multicolumn{5}{l}{\textcolor{white}{\bfseries Task 1 - access and
account set up}} \\
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\Xhline{0.25pt}
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\rowcolor{black}
\multicolumn{5}{l}{\textcolor{white}{\bfseries Task 2 - learning how to map}} \\*
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\rowcolor{black}
\multicolumn{5}{l}{\textcolor{white}{\bfseries Task 3 -
contributing data by classifying maps}} \\
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\Xhline{0.25pt}
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\Xhline{0.25pt}
Heading
& TEXT.
& TEXT.
& TEXT.
& TEXT. \\
\end{tabularx}
\end{landscape}
\end{document}
color软件包被移除，已经被覆盖xcolorepstopdfgraphicx无论如何，如果必要的话，软件包将被删除、加载[main=british]规范而不是仅仅[british]为了babelgeometry仅加载booktabs一次captionmakecellpdflscapeafterpage
您应该考虑使用newtxtext和newtxmath而不是mathptmx包；它们提供更好的字形选择，在数学上具有更好的间距并且更贴合文本字体，并提供更多的灵活性。