[Tex/LaTex] What’s wrong with usepackage{algorithm2e}

algorithm2eoverleaf

I am using a journal template to write a paper, but when I add 

\usepackage[ruled]{algorithm2e}

to it, it will automatically collapse with error like 

/usr/share/texlive/texmf-dist/tex/latex/relsize/relsize.sty:220:
Runaway argument?
{10}
Paragraph ende
d before \@tempb was complete.
<to be read again> 
                   \par 
l.220 \@tempa\small

What's wrong with it? How do I solve it?

Note that the package algorithm2e is needed in my paper.

My code is in https://www.overleaf.com/5851896cgssfm

Main.tex

\documentclass[twocolumn]{autart}
\usepackage{amsmath}

\usepackage{mathrsfs,makecell}          % Enable this line and disable the
                               % preceding line to obtain a two-column
                               % document whose style resembles the
                               % printed Automatica style.


\usepackage{graphicx}          % Include this line if your
                               % document contains figures,
\usepackage[dvips]{epsfig}     % or this line, depending on which
                               % you prefer.
\usepackage{amsfonts}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amsfonts, amssymb}
\usepackage{subfigure}
\usepackage{cite}
\usepackage[subnum]{cases}
\usepackage{multicol}
\usepackage{multirow}
\usepackage[justification=centering]{caption} 
\usepackage[ruled]{algorithm2e}

\newtheorem{theorem}{Theorem}
\newtheorem{corollary}{Corollary}
\newtheorem{definition}{Definition}
\newtheorem{lemma}{Lemma}
\newtheorem{assumption}{Assumption}
\newtheorem{proposition}{Proposition}
\newtheorem{remark}{Remark}
\newtheorem{example}{Example}
\allowdisplaybreaks 

\renewcommand{\baselinestretch}{0.9}

\def\BibTeX{{\rm B\kern-.05em{\sc i\kern-.025em b}\kern-.08em
    T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX}}

\begin{document}

 \begin{frontmatter}
 \title{Test
 \vspace{-3.5ex}
 \thanksref{footnoteinfo}}

 \thanks[footnoteinfo]{}

 \author[li]{Wangyan Li}
 %\corauth[cor1]{Corresponding author. Tel.: +86 21 55271299; fax: +86 21 55271299.}

 \address[li]{Business School, University of Shanghai for Science and Technology, Shanghai, China.\vspace{-1.5ex}}


 \begin{keyword}
 \end{keyword}

 \vspace{-1.0ex}
 \begin{abstract}
In this paper,
 \end{abstract}
 \end{frontmatter}
\end{document}

autart.cls (too big to post, please find it on https://www.overleaf.com/5851896cgssfm)

Thanks!

Best Answer

(Clicking on "PROJECT" in Overleaf's top bar will display the file list; the file autart.cls can then be viewed.)

Sounds related to this question, where relsize isn't compatible with amsart.cls (and probably autart.cls as well.)

Adding the norelsize option to algorithm2e gets rid of this error, but then you'd get another error: 

Error: Command \algorithm already defined.
          Or name \end... illegal, see p.192 of the manual.

Check in autart.cls, and you'll indeed see it already defines its own algorithm environment.

So it does look like algorithm2e isn't compatible with this journal document class!

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