!放错位置 \omit.\multispan ->\omit@\multispan

Question

我正在尝试使用以下命令以 2x2 格式显示 4 个 .jpg 文件：

\begin{figure}[htb]
\centering
  \begin{tabular}{@{}cccc@{}}
    \includegraphics[scale=0.26]{error1.jpg} 
    \includegraphics[scale=0.26]{afperror1.jpg} \\
    \includegraphics[scale=0.26]{error2.jpg} 
    \includegraphics[scale=0.26]{afperror2.jpg} 
    \multicolumn{4}{c}{\includegraphics[width=.23\textwidth]}
  \end{tabular}
\end{figure}

但我收到以下错误：

!Misplaced \omit.\multispan ->\omit@\multispan ...c}

这很奇怪，因为查看生成的 PDF 时图像渲染正常。是什么导致了这个问题？

Answer 1

\begin{figure}[htb]
\centering
  \begin{tabular}{@{}cc@{}}
    \includegraphics[scale=0.26]{error1.jpg}            & 
    \includegraphics[scale=0.26]{afperror1.jpg} \\
    \includegraphics[scale=0.26]{error2.jpg}             &
    \includegraphics[scale=0.26]{afperror2.jpg}           \\
    \multicolumn{2}{c}{\includegraphics[width=.23\textwidth]{something}}
  \end{tabular}
\end{figure}