字幕问题

Question

我正在写一些笔记，当我添加图形标题时出现以下错误：

Illegal parameter number in definition of reservad@a
<to be read again>
\crcr

这是代码：

\documentclass[12pt]{article}
\usepackage{amsmath, amssymb, graphicx, tikz}

\begin{document}
\begin{figure}
\centering
\includegraphics[width=.7\textwidth]{pic.png}
\caption{\overrightarrow{\mathbf{AB}}}\label{some-label}
\end{figure}
\end{document}

Answer 1

\documentclass[12pt]{article}
\usepackage{amsmath, amssymb, graphicx, tikz}

\begin{document}
\begin{figure}
\centering
%\includegraphics[width=.7\textwidth]{pic.png}
\caption{$\protect\overrightarrow{\mathbf{AB}}$}\label{some-label}
\end{figure}
\end{document}