[Tex/LaTex] Why does `! Missing $ inserted.` occur when using \verb in beamer

Question

When I use \verb+...+ within beamer I get

! Missing $ inserted.
<inserted text> 
                $
l.6 \end{frame}

? 

What is going wrong and how do I fix this problem?

A minimal example is

\documentclass{beamer}

\begin{document}
\begin{frame}{Title}
Some text \verb+\int+
\end{frame}
\end{document}

Answer 1

You can fix the problem by adding fragile:

\documentclass{beamer}

\begin{document}
    \begin{frame}[fragile]{Title}
        Some text \verb+\int+
    \end{frame}
\end{document}