How to set 3 pictures on the same line
<p>I'm writing my thesis report and I get some help about LaTeX.
I would like to set 3 pictures on the same line and make 3 x 3 pictures per page.</p>

<p>This is my script :</p>

<pre><code>\begin{figure}[!h]
    \centering
    \begin{subfigure}[b]{0.3\textwidth}
        \includegraphics[width=\textwidth]{./Stage/Data/Field5_SN_map_final.png}
    \end{subfigure}
    \begin{subfigure}[b]{0.3\textwidth}
        \includegraphics[width=\textwidth]{./Stage/Data/Field6_SN_map_final.png}
    \end{subfigure}
    \begin{subfigure}[b]{0.3\textwidth}
        \includegraphics[width=\textwidth]{./Stage/Data/Field7_SN_map_final.png}
    \end{subfigure}
\end{figure}
</code></pre>

<p>But I get some errors : </p>

<p><a href="https://i.stack.imgur.com/fOk0c.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fOk0c.png" alt="enter image description here"></a></p>

<p>Do you have any idea to solve my problem ?</p>

<p>Thank you !</p>