latex figure Missing number, treated as zero. ＜to be read again＞

\begin{figure}[h]
  \centering
  \includegraphics[width=\linewidth]{pictures/architecture.pdf}
  \caption{Typical architecture.}
  \label{fig:architecture}
\end{figure}，

我在编译latex，这段代码报错，

Missing number, treated as zero.
<to be read again>，

Illegal unit of measure (pt inserted).
<to be read again>，

应该怎么修改

可能是 忘了引入 graphicx 宏包

\documentclass{article} % 或其它 document class
\usepackage{graphicx}   % <--- 添加这个宏包！

\begin{document}