什么原因导致此 \endcsname 错误?

什么原因导致此 \endcsname 错误?

我是 LaTeX 的新手,我不明白这里出了什么问题。我没有做任何更改,但突然间,代码无法运行。你能帮助我吗?

) (./Final_Halper_410Latex.aux
! Missing \endcsname inserted.
<to be read again> 
                   \protect 
l.22 \@writefile
                {toc}{\contentsline {section}{\numberline {II}Methods}{2}{}}
? 

相关代码行如下:

\pdfoutput=1 % For pdflatex
\documentclass[aps,prd,floatfix,nofootinbib,twocolumn]{revtex4-1}

\usepackage{graphicx}% Include figure files
\usepackage{amsmath}
\usepackage{caption}

%Uncomment the two lines below if you are using BibTex
%\bibliographystyle{apsrev4-1}
%\renewcommand*{\bibfont}{\raggedright} %Removes strange justification problems in bibliography when using Bibtex and Revtex 4-1

\begin{document}
.
.
.
\section{Methods}

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