I commonly use the listings package to showcase code in my LaTex documents. I tried doing the same in my Beamer slidedecks and I ran into an issue where the LaTex source code failed to compile. After digging around, I figured out its because every slide or frame that includes code (or any verbatim environment) needs to be marked as fragile. A minimal example is presented below:
\documentclass{beamer}
\usepackage[utf8]{inputenc}
% Beamer Packages
\usepackage{harvard}
\usetheme{Copenhagen}
% Code Rendering Packages
\usepackage{listings}
\lstset{
language=Java,
columns=flexible,
}
% Begin Slidedeck
\begin{document}
\begin{frame}[fragile]{Code Example}
\begin{lstlisting}
int x = 5;
\end{lstlisting}
\end{frame}
\end{document}
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