求助 卡在了三线表

因为不会插三线表 照猫画虎运行不出来 求助
\begin{table}[!h]
\tabcolsep 0pt
\caption{Distance error table}
\vspace*{-12pt}
\begin{center}
\def\temptablewidth{\textwidth}
{\rule{\temptablewidth}{1pt}}
\begin{tabular*}{\temptablewidth}{@{\extracolsep{\fill}}lll1}
& MAE & MSE &RMSE \\ \hline
LNSM calculation（school） & 1.1429& 1.4620 &1.2091 \\
Distance optimization formula （school）&0.6128& 0.4171&0.6458 \\
LNSM calculation （ railway ）&0.8854& 0.8725 &0.9341 \\
Distance optimization formula（ railway ）&0.4631& 0.2394&0.4893
\end{tabular*}
{\rule{\temptablewidth}{1pt}}
\end{center}
\end{table}