Trouble with org-mode, beamer and stmaryrd

% Created 2015-01-08 Thu 18:04
\documentclass[bigger]{beamer}

      \mode<{{{beamermode}}}>

      \usetheme{{{{beamertheme}}}}

      \usecolortheme{{{{beamercolortheme}}}}

      \beamertemplateballitem

      \setbeameroption{show notes}
      \usepackage[utf8]{inputenc}

      \usepackage[T1]{fontenc}

      \usepackage{hyperref}

      \usepackage{color}
      \usepackage{listings}
      \lstset{numbers=none,language=[ISO]C++,tabsize=4,
  frame=single,
  basicstyle=\small,
  showspaces=false,showstringspaces=false,
  showtabs=false,
  keywordstyle=\color{blue}\bfseries,
  commentstyle=\color{red},
  }

      \usepackage{verbatim}

      \institute{{{{beamerinstitute}}}}

       \subject{{{{beamersubject}}}}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{fixltx2e}
\usepackage{graphicx}
\usepackage{longtable}
\usepackage{float}
\usepackage{wrapfig}
\usepackage{rotating}
\usepackage[normalem]{ulem}
\usepackage{amsmath}
\usepackage{textcomp}
\usepackage{marvosym}
\usepackage{wasysym}
\usepackage{amssymb}
\usepackage{hyperref}
\tolerance=1000
\usepackage{stmaryrd}
\author{Eric S Fraga}
\date{2010-03-30 Tue}
\title{Writing Beamer presentations in org-mode}
\hypersetup{
  pdfkeywords={},
  pdfsubject={},
  pdfcreator={Emacs 24.3.1 (Org mode 8.2.10)}}
\begin{document}

\maketitle
\tableofcontents


\section{Introduction}
\label{sec-1}

Some text here

A formula:

\[ \llbracket 234 \rrbracket \]
% Emacs 24.3.1 (Org mode 8.2.10)
\end{document}