latex error can be used only in preamble
这是需要的代码部分
\section{\Large\textbf{Table}}
\usepackage{multirow}
\hline \multirow{2}* {$\textbf{IF}\ (dist)\ P_1 \textbf{ELSE}\ P_2$}& $(\ AssChk(M,dist) \bigwedge AssChk(M,[\kern-0.15em[P_1]\kern-0.15em])) \bigvee$ \\ {}& $(\neg \ AssChk(M,dist) \bigwedge AssChk(M,[\kern-0.15em[P_2]\kern-0.15em]))$ \\
但是提示latex error: can be used only in preamble
求各位大神帮助解决一下 速求