我收到了问题标题中提到的错误。
\begin{table*}[!ht]
\centering
\caption{\textit{first scenario : heuristic methods}} \label{Table2}
\resizebox{2\columnwidth}{!}{%
\begin{tabular}{|ccc||cccc||cccccccc|}
\multicolumn{3}{c}{\textbf{Instances}}
&\multicolumn{4}{c}{\textbf{Weekly Problem}}
&\multicolumn{8}{c}{\textbf{Daily Problem}}
&\multicolumn{3}{c}{}
&\multicolumn{4}{c}{\underline{Heuristic (WPA)}}
&\multicolumn{2}{c}{} & \multicolumn{3}{c}{\underline{Heuristic (DPA)}} & \multicolumn{3}{c}{\underline{Large Neighborhood Search (LNS)}}
\\
Staff &Activities &Periods &Workload &Transport costs &Time(s) &Gap &Total activities &Activities added &Total cost &Time(s) &Gap &Total cost &Time(s) &Gap \\ \hline
3 &72 &10 &391 &2175 &5 &0\% &90 &18 &2425 &3600 &28\% &3839 &2012 &21\% \\
\hline
3 &72 &10 &360 &2254 &2 &0\% &90 &18 &2654 &3600 &36\% &3095 &2000 &24\% \\
\hline
3 &72 &10 &402 &2147 &7 &0\% &90 &18 &2887 &3600 &33\% &3581 &2004 &22\% \\
\hline
5 &120 &10 &179 &2812 &2000 &1\% &150 &30 &4101 &3600 &59\% &5194 &2000 &22\% \\
\hline
5 &120 &10 &359 &3432 &101 &5\% &150 &30 &5120 &3600 &44\% &6646 &2005 &24\% \\
\hline
5 &120 &10 &285 &3409 &489 &7\% &150 &30 &4325 &3600 &34\% &6156 &2001 &23\% \\
\hline
6 &140 &10 &137 &3384 &616 &13\% &175 &35 &6387 &3600 &70\% &8382 &2000 &25\% \\
\hline
6 &140 &10 &240 &3145 &2000 &9\% &175 &35 &6175 &3600 &64\% &8425 &2000 &21\% \\
\hline
6 &140 &10 &198 &3454 &1871 &12\% &175 &35 &6324 &3600 &57\% &8642 &2000 &22\% \\
\hline
\end{tabular}%
}
\end{table*}
谢谢。
答案1
您忘记结束第一行：
\begin{tabular}{|ccc||cccc||cccccccc|}
\multicolumn{3}{c}{\textbf{Instances}}
&\multicolumn{4}{c}{\textbf{Weekly Problem}}
&\multicolumn{8}{c}{\textbf{Daily Problem}}\\ % end of first row
\multicolumn{3}{c}{}
&\multicolumn{4}{c}{\underline{Heuristic (WPA)}}
&\multicolumn{2}{c}{} &
\multicolumn{3}{c}{\underline{Heuristic (DPA)}} &
\multicolumn{3}{c}{\underline{Large Neighborhood Search (LNS)}}\\