Too deeply nested error with beamer

Question

in this code I get a too deeply nested error

I used this command \usepackage[loadonly]{enumitem} to fix error,but all items become on the same level. Any help please?

\documentclass[compress,red]{beamer}
\usepackage{etex}
\mode<presentation>
 \usetheme{Warsaw}
 \usepackage[applemac]{inputenc}%les accents pour mac
 \usepackage{caption}
 \captionsetup{font=small}
 \captionsetup{labelformat=empty}
 \usepackage{subfigure}
 \usepackage{multicol}
 \usepackage{animate}
  \usepackage{movie 15}
 \usepackage{amsmath}
 \usepackage{epsfig}
 \usepackage{graphicx}
 \usepackage[all,knot]{xy}
 \xyoption{arc}
 \usepackage{url}
 \usepackage{array,ragged2e}
 %\usepackage{multimedia}
%\usepackage{hyperref}
 \usepackage{setspace}
\usepackage{multirow} 

 \begin{document}
 \section{section1 }
 \frame[shrink]{\frametitle{Titre de la fenetre}
 \begin{itemize}
 \item Optimisation problem
 \begin{itemize}
 \setbeamercolor*{item}{fg=green}
 \item \tiny chamfer distance
 \item Algorithme d’optimisation
 \textit{\begin{enumerate}
 \item step1
 \item step2
 \item step3
 \begin{itemize}
 \item step3.1
 \item step3.2
 \item step3.3
 \item step3.4
 \itemstep3.5
 \end{itemize}
 \item step4
 \end{enumerate} }
 \end{itemize}
 \end{itemize}
 }
 \end{document}

Answer 1

The error message too deeply nested error is removed if the description environment is used. It seems that (and I quote) "There are three predefined environments for creating lists, namely enumerate, itemize, and description. The first two can be nested to depth three". This comment pushes me to use 'description' and it does work. Please check page 111-114 of beamer user manual.

Code

\documentclass[compress,red]{beamer}
\usepackage{etex}
\mode<presentation>
\usetheme{Warsaw}
 \usepackage[applemac]{inputenc}%les accents pour mac
 \usepackage{caption}
 \captionsetup{font=small}
 \captionsetup{labelformat=empty}
 \usepackage{subfigure}
 \usepackage{multicol}
 \usepackage{animate}
 \usepackage{movie 15}
 \usepackage{amsmath}
 \usepackage{epsfig}
 \usepackage{graphicx}
% \usepackage[all,knot]{xy}
% \xyoption{arc}
 \usepackage{url}
 \usepackage{array,ragged2e}
 %\usepackage{multimedia}
\usepackage{hyperref}
\usepackage{setspace}
\usepackage{multirow} 

 \begin{document}
 \section{section1}
\begin{frame}[shrink=0]
\frametitle{Titre de la fenetre}
 \begin{enumerate}
 \item Optimisation problem
 \begin{itemize}
 \setbeamercolor*{item}{fg=green}
 \item{\tiny chamfer distance}
 \item Algorithme d'optimisation
\textit{\begin{itemize}
 \item step1
 \item step2
 \item step3
 \begin{description}[abc]  % for indentation of length of abc
 \item[$\bullet$] step3.1
 \item[$\bullet$] step3.2
 \item[$\bullet$] step3.3
 \item[$\bullet$] step3.4
 \item[$\bullet$] step3.5
 \end{description}
 \item step4 
 \end{itemize}}
 \end{itemize}
 \end{enumerate}
\end{frame}
\end{document}