缺少 $ 插入问题书目 LLNCS 模板

Question

我的参考书目中出现了一个奇怪的缺失 $ 错误

\documentclass[runningheads]{llncs}
\usepackage{hyperref}
\usepackage{cleveref}

\begin{document}
%
\title{adsnvuadsipnvewjl\thanks{Supported by University of Alberta}}
 \author{Hao Sun\inst{1}\orcidID{0000-0002-2000-8080} 
 }
%
\authorrunning{Hao Sun}
\institute{University of Alberta, Alberta, Canada}
%
\maketitle              % typeset the header of the contribution
%
\begin{abstract}
 jasdkflasdgfhudafyhebvkcyfhdsuifgakhewnfcgyuzshvcdsyuafcgkdsh 
nbcvasdkfhvuban,vcyuaebvndskaguyrhvba.
\keywords{advdasv dav}
\end{abstract}
\section{Introduction}
Our problem is one of Karp's original 21 NP-hard problems \cite{Karp1972}. 

%
% ---- Bibliography ----
%
% BibTeX users should specify bibliography style 'splncs04'.
% References will then be sorted and formatted in the correct style.
%
 \bibliographystyle{splncs04}
 \bibliography{main}

\end{document}

主要.bib：

@Inbook{Karp1972,
author="Karp, Richard M.",
editor="Miller, Raymond E.
and Thatcher, James W.
and Bohlinger, Jean D.",
title="Reducibility among Combinatorial Problems",
bookTitle="Complexity of Computer Computations: Proceedings of a symposium on the Complexity of Computer Computations, held March 20--22, 1972, at the IBM Thomas J. Watson Research Center, Yorktown Heights, New York, and sponsored by the Office of Naval Research, Mathematics Program, IBM World Trade Corporation, and the IBM Research Mathematical Sciences Department",
year="1972",
publisher="Springer US",
address="Boston, MA",
pages="85--103",
abstract="",
isbn="978-1-4684-2001-2",
doi="10.1007/978-1-4684-2001-2_9",
url="https://doi.org/10.1007/978-1-4684-2001-2_9"
}

我已经看到了解决方案 缺少 $ 插入问题 使用 \usepackage[strings]{underscore} 但这与我的实际论文中的很多内容冲突，所以我希望有更简单的东西。