环境：texlive2019 + texstudio2.12.18 使用IEEEtran出现了错误 `undefined control sequence \maketitle` ``` \documentclass{IEEEtran} \IEEEoverridecommandlockouts \usepackage[dvips]{graphicx} \usepackage{multirow} \usepackage[left=0.71in,top=0.94in,right=0.71in,bottom=1.18in]{geometry} \setlength{\columnsep}{0.24in} \begin{document} % paper title \title{\huge Preparation of Papers in Two-Column Format} % author names and affiliations \author{\authorblockN{Karen Garfield and Mickey Mouse} \authorblockA{\textit{Department of Nuclear Power Engineering}\\ \textit{University of Northland}\\ \textit{Iqaluit, Nunavut, M2M 6H6, Canada}\\ \textit{\{kgarfield, mmouse\}@unorthland.ca}\\} }% % make the title area \maketitle \begin{abstract} Here is abstract contents. \end{abstract} \section{Introduction} % no \PARstart Here is introduction contents. \end{document} ```