Can't insert code in my beamer slide

Question

I want to put some PHP code in my slide with the package listings but I have this error message:

Argument of \frame has an extra }.<inserted text>\par }

My latex code :

\documentclass{beamer}

\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc}
\usepackage[frenchb]{babel}
\usepackage{setspace}
\usepackage{color}
\usepackage{listings}

\usetheme{CambridgeUS}


\begin{frame}
\begin{large}
    Contexte : \newline \pause
\end{large}

\begin{itemize}
    \item Avertir Drupal
\end{itemize}
\begin{lstlisting}

// Gestion du contexte ete2013
// Utilisation d'un nouveau template
if (%variables['ctpage'] == "ete2013") {
    variables['template_files']=array('page-ete');
}
\end{lstlisting}
\end{frame}

Answer 1

Your example has two problems:

• No \begin/end{document}
• Missing fragile in \begin{frame} (explanation see below)

This example works:

\documentclass{beamer}

\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc}
\usepackage[frenchb]{babel}
\usepackage{setspace}
\usepackage{color}
\usepackage{listings}

\usetheme{CambridgeUS}
\begin{document}

\begin{frame}[fragile]
\begin{large}
    Contexte : \newline \pause
\end{large}

\begin{itemize}
    \item Avertir Drupal
\end{itemize}
\begin{lstlisting}

// Gestion du contexte ete2013
// Utilisation d'un nouveau template
if (%variables['ctpage'] == "ete2013") {
    variables['template_files']=array('page-ete');
}
\end{lstlisting}
\end{frame}
\end{document}

Explanation: beamer-frames can't handle verbatim environment (and listings is a kind of verbatim). If a frame contains a verbatim (or listings)-environment, the frame must contain the option fragile. You can find some details in a blog article.