2 mcmthesis的模板的使用,如果加\maketitle指令就出现两个摘要，如果不加就一个摘要也不显示

\documentclass{mcmthesis}
\mcmsetup{CTeX = false, tcn = 2013083, problem = F,
    sheet = true, titleinsheet = true, keywordsinsheet = true,
    titlepage = true, abstract = true}
\usepackage{newtxtext}%\usepackage{palatino}
\usepackage{lipsum}
\newcommand{\upcite}[1]{\textsuperscript{\textsuperscript{\cite{#1}}}} 
\title{How Should the UN Respond for EDPs}
\begin{document}
    \begin{abstract}
    \lipsum[1]
    \begin{keywords}
        A; B;C
    \end{keywords}
    \end{abstract}
    \maketitle%加这个命令，就出现两个Abstruct，而且还报错；不加就一个也没有
    \section{Introduction}
    \subsection{Background}
    
    \subsection{Statment of the problem}
    \lipsum[2]
    \section{Components of the model}
    \begin{enumerate}
        \item abc
        \item abc
        \item abc
    \end{enumerate}
    \section{Measuring the scope of People at risk}
    \subsection{Prediction of sea level rise}
\end{document}

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