# Beamer error, does not produce any output

\documentclass{beamer}
\usefonttheme[onlylarge]{structurebold}
\setbeamerfont*{frametitle}{size=\normalsize,series=\bfseries}
\usepackage[english]{babel}
%\usepackage[latin1]{inputenc}
\usepackage{times}
\usepackage[T1]{fontenc}
\usepackage{subfig}
\usepackage{amssymb,amsmath,graphicx,charter,latexsym}
\usepackage{enumerate}
\usepackage{comment}
\usepackage{verbatim}
\usepackage{bbm}
% Setup TikZ

\usepackage{tikz}
\usetikzlibrary{arrows}
\tikzstyle{block}=[draw opacity=0.7,line width=1.4cm]

% Author, Title, etc.

\title[xx]
{%
Max Weight Scheduling: Unscaled Queue Dynamics in Heavy Traffic.%
}

\author[x,y]
{
x \and
y
}

%\date[WABI 2006]

% The main document

\begin{document}

\begin{frame}
\titlepage
\end{frame}

\begin{frame}{Outline}
\tableofcontents
\end{frame}

\section{Timely Throughput Model}

\subsection{The Model}
\begin{frame}[t]{Guarantee per packet Hard Deadline Constraints}
\begin{block}
\begin{itemize}
\item Clients generate packets with fixed period $\tau$.  .
\item Packets expire and are dropped if not delivered by the deadline.
\item Hence delay of successfully delivered packet is at most $\tau$.
\item Delivery ratio of packets that meet deadline for client $n$ should be at least $q_{n}$, i.e.
$$\liminf\limits_{T\to\infty} \frac{1}{T}\sum\limits_{t=1}^{T}\mathbbm{1}\{\mbox{client i's packet is delivered in frame t}\}\geq q_{i}.$$
\end{itemize}
\end{block}
\end{frame}

\begin{frame}[t]{A Minimum Delivery-Ratio Required.}
\begin{block}
\begin{itemize}
\item Delivery ratio of packets that meet deadline for client $n$ should be at least $q_{n}$, i.e.
$$\liminf\limits_{T\to\infty} \frac{1}{T}\sum\limits_{t=1}^{T}\mathbbm{1}\{\mbox{client i's packet is delivered in frame t}\}\geq q_{i}.$$
\end{itemize}
\end{block}
\end{frame}

\end{document}

• Please note that \tikzstyle is obsolete! Use \tikzset{mystyle/.style={red}} instead. – Tobi Aug 1 '13 at 22:43

I think your block environments need titles; thus

\begin{block}{A nice block}


rather than just

\begin{block}


A more minimal example that reproduces the problem is

\documentclass{beamer}
\begin{document}
\begin{frame}{A nice frame}
\begin{block}{A nice block}  %Comment out {A nice block} to crash TeX.
\begin{itemize}
\item abc
\end{itemize}
\end{block}
\end{frame}
\end{document}


Finally, note that $ and $ are preferable to .

• Or just \begin{block}{}...\end{block} if no title is desired for the block. – Gonzalo Medina Aug 1 '13 at 21:57