扫描时文件结束，使用 \xdblarg

Question

在编译我的 LaTeX 文档时，我在一开始（第一行）就遇到了这个错误，错误是file ended while scanning use of \xdblarg。以下是我的代码：

\documentclass[11pt,a4,2side]{report} 
\usepackage[T1]{fontenc}  
\usepackage{setspace}
\onehalfspacing                                       
\usepackage[font=small,labelfont=bf]{caption}
\usepackage{arial}\usepackage{authblk}          % for affiliation
\usepackage{graphicx}         % for pictures
\usepackage{amsmath, amssymb, amsfonts}                  % for maths mode
\usepackage{siunitx}          % This helps to write units such as angstrom, micrometer, etc.
\usepackage{nicefrac}  % for nice fraction
\usepackage{subfig}
\usepackage{sidecap}
\usepackage{mhchem}           % for molecular formulae as in chemistry.
\usepackage[font=small]{caption}                       % for bold font caption
\usepackage{enumitem}         % package for creating lists
\usepackage{color}            % for using colour
\usepackage{hyperref}         % for labeling and cross-referencing in texts which is 
\usepackage{refstyle}
\usepackage[square, super]{natbib}         % for the bibliography\reference citation number as a supescript in square brackets.  
\usepackage[nottoc]{tocbibind}             % This helps to include the References(Bibliography) in the table of contents if it isn't 
                                             % already included there.                                     
\usepackage[titletoc]{appendix}            % This helps to include the Appendices in 

\begin{document}

所以错误仅指向第 1 行。有人能帮我解决这个问题吗？谢谢

Answer 1

我发现这会导致“文件在扫描@xdblarg 的使用时结束”错误：

\subsubsection{这是编号子节的标题]

注意右端的方括号，应该是花括号。我认为任何以错误括号结尾的命令都可能导致此错误。

我通过在每一页中输入“\end{document}”来找到它，直到找到导致错误的页面，并将注意力集中在该页面上。