! 缺少插入 \endcsname。\MessageBreak

Question

嗨，我正在做一个 LaTeX 项目，遇到了一些错误。其中一个是

缺少插入的 \endcsname。\MessageBreak

这是我的代码

\documentclass[smallcondensed]{svjour3}
\usepackage[utf8]{inputenc}
\usepackage{latexsym,amsmath,amsfonts,amssymb,braket}
\usepackage{array}
\usepackage{listings}
\usepackage{ifmtarg}
\usepackage{calc}
\usepackage{marvosym}
\usepackage{nccrules}

\usepackage{booktabs}
\usepackage{multirow}
\usepackage{mathptmx}

\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{caption}
\captionsetup{compatibility=false}
\usepackage{lmodern}


\usepackage{url}
\usepackage[noend]{algpseudocode}
\usepackage[table]{xcolor}
\usepackage[labelfont=bf]{caption}
\usepackage{listings}
\usepackage{courier}
\usepackage{enumitem}
\usepackage{emptypage}
\usepackage{wrapfig,lipsum,booktabs}

\usepackage{todonotes}

%%table footnote
\usepackage{footnote}
\makesavenoteenv{tabular}
\makesavenoteenv{table}

\usepackage{graphicx}

\usepackage[colorlinks=true,allcolors=blue,breaklinks=true]{hyperref}
\usepackage{breakcites} %%break citation
\usepackage{ragged2e}
\usepackage{listings}
\usepackage[table]{xcolor}
\usepackage{subcaption} %%for subcaption command
\usepackage{tabularx}


\definecolor{Gray}{gray}{0.9}
\definecolor{mygray}{rgb}{0.1,0.1,0.1}

\usepackage{tikz}
\usetikzlibrary{calc}
\usepackage{relsize}


\usepackage{fancyhdr}
\usepackage{lastpage}


 \title{  \textbf{ Mining Time-constrained Sequential
Patterns with Constraint Programming} }
\author{ \textbf {John O.R. Aoga \and  Tias Guns \and Pierre
Schaus}}
\date{}

\begin{document}

\maketitle


\begin{abstract}

 \textbf {Abstract} Programming (CP) has proven to be an effective platform for
constraint based sequence mining. Previous work has focussed on standard frequent
sequence mining, as well as frequent sequence mining with a maximum ’gap’ between
two matching events in a sequence. The main challenge in the latter is that this cons-
traint can not be imposed independently of the omnipresent frequency constraint.
Indeed, the gap constraint changes whether a subsequence is included in a sequence,
and hence its frequency. In this work, we go beyond that and investigate the in-
tegration of timed events and constraining the minimum/maximum gap as well as
minimum/maximum span. The latter constrains the allowed time between the first
and last matching event of a pattern. We show how the three are interrelated, and
what the required changes to the frequency constraint are. Key in our approach is
the concept of an extension window defined by gap/span and we develop techniques
to avoid scanning the sequences needlessly, as well as using a backtracking-aware
data structure. Experiments demonstrate that the proposed approach outperforms
both specialized and CP-based approaches in almost all cases and that the advantage
increases as the minimum frequency threshold decreases. \\
\\ \textbf {Keywords} Data mining · Sequential pattern mining · Constraint programming ·
Global constraint · Gap constraint · Span constraint · Time constraint
\institute{J.B. Doe
\at Doe Institute, 281 Prime Street, Daisy Town, NA 02467,
USA\\Tel.: [phone], Fax: [phone]
\and
J.B. Doe \and S.Q. Public
\at Public-Enterprises
\and
J.A. Smith
\at Smith University,\\\email{[email protected]}
}
\end{abstract}

\section*{1 Introduction}

\end{document}

同样对于此类（svjour3），我应该看到我\institute在摘要末尾输入的作者地址，但什么也没有。

帮我。

Answer 1

我找到了。我只需要\Institute{}在之前使用\begin{document}

像那样

\institute{J.O.R Aoga
\at Institute of Information and Communication Technologies, Electronics and Applied Mathma-
tics (ICTEAM), UCLouvain, Belgium
Ecole Doctorale Science de l’Ingénieur (ED-SDI), Université d’Abomey-Calavi (UAC), Bénin\\Orcid Id: 0000-0002-7213-146X 
\\\email{john.aoga@\{uclouvain.be,gmail.com\}}
\and
T. Guns
\at Vrije Universiteit Brussel (VUB), Brussels, Belgium
Katholieke Universiteit Leuven, Belgium 
\\\email{tias.guns@\{vub.ac.be,cs.kuleuven.be\}}
\and
P. Schaus
\at Institute of Information and Communication Technologies, Electronics and Applied Mathma-
tics (ICTEAM), UCLouvain, Belgium
\\\email{[email protected]}
}
\date{}


\begin{document}