[XeTeX] Command \ aemph Already defined

[@@]

Hi,

The syntax of my old files is corrupted apparently because of this error:


Command \ aemph Already defined.
Or name \ end ... illegal, see p.192 of The Manual.

\documentclass{article}
\usepackage{bidi}
\usepackage{xltxtra}
\usepackage{polyglossia}
\setmainlanguage{english}
\setotherlanguage{arabic}

\usepackage{arabxetex}
\setmainfont{Lucida Grande} % or your favorite
\usepackage{geometry}

\geometry{ hmargin=1.5cm, vmargin=1cm }

\begin{document}

\begin{center}
\begin{arab}[voc]{\Huge}
{\Huge 'a.hkAmu al-rrA' }
\end{arab}
\end{center}

\begin{center}
\begin{arab}[trans]
%{al-?ay? al-`?lim Na??r al-D?n al-??s?}
 \Large
\textit{'a.hkAmu al-rrA'}\textrm{ ( Règles du Ra)}
\end{arab}
\end{center}
\end{document}


Where can I find this command in order to correct it? How should reorder my
packages?


Regards
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