表格的格式问题，没有公式时可以正常使用，加入公式后出现! Package array Error:  Illegal pream-token (x): `。求教是哪里出现问题。

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\begin{document}

\begin{table*}

\caption{Parameter values of BS model}

\begin{tabularx}{\textwidth}{@{} llx@{}}

\toprule

Variable & Value & Explanation\\

\midrule

\multirow{2}{*}{$S_0$}  &\$5.3761m     & Discounted value of net cash flow in the first year.\\

&\$35.5995m  & The sum of the present value of the total net cash flow during the economic life of the entire equipment.\\

K                       &\$6.46m      &The execution price is expressed by the initial investment amount of the desulfurization equipment.\\

$\sigma$         &31.44\%   &The volatility of fuel price.\\

Discount rate    &11\%       &Discount rate is weighted average capital cost (WACC).\\ 

T              &15y       &Economic Life of Desulfurization Equipment.\\

$\Delta t$       &1y       &Interval time\\

\bottomrule

\end{tabularx}

\end{table*}

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