imakeidx and XeTeX [closed]

Question

I've got a problem because I need to work with XeLaTeX to typeset in Brill fonts and would very much like to use imakeidx to have my two indexes/indices. What should I do?

This is my code:

% XeLaTeX can use any Mac OS X font. See the setromanfont command below.
% Input to XeLaTeX is full Unicode, so Unicode characters can be typed directly into the source.

% The next lines tell TeXShop to typeset with xelatex, and to open and save the source with Unicode encoding.

%!TEX TS-program = xelatex
%!TEX encoding = UTF-8 Unicode
\documentclass[11pt]{book}
\usepackage{ledmac}
\usepackage{fancyhdr}
\pagestyle{myheadings}
\usepackage{hanging}
\textheight = 180.5 mm
\textwidth = 108.5 mm
\pagenumbering{arabic}

\usepackage{imakeidx} 
\makeindex[name=nominum, title=Index nominum, columns=2]
\makeindex[name=rerum, title=Index rerum, columns=2]


\input{style}
\raggedbottom


\newcommand*{\LeftWidth}{3.0cm}%
\newcommand*{\RightWidth}{\dimexpr\linewidth-\LeftWidth-2em\relax}%
\newcommand{\AlignedBrace}[2]{%
    \medskip\par\noindent%
    \parbox{\LeftWidth}{\raggedleft\textbf{#1}\strut~}%
    $\left\{~\parbox{\RightWidth}{\strut\textit{#2}\strut}\right.$%
}%


%\usepackage{geometry}                % See geometry.pdf to learn the layout options. There are lots.
%\geometry{a4paper}                   % ... or a4paper or a5paper or ... 
%\geometry{landscape}                % Activate for for rotated page geometry
%\usepackage[parfill]{parskip}    % Activate to begin paragraphs with an empty line rather than an indent
\usepackage{graphicx}
\usepackage{amssymb}
\usepackage{amsmath}
%\renewcommand %These two commands are for double-spacing
%\baselinestretch{2}

% Will Robertson's fontspec.sty can be used to simplify font choices.
% To experiment, open /Applications/Font Book to examine the fonts provided on Mac OS X,
% and change "Hoefler Text" to any of these choices.

\usepackage{fontspec,xltxtra,xunicode}
\defaultfontfeatures{Mapping=tex-text}
\setromanfont[Mapping=tex-text]{Brill}
\setsansfont[Scale=MatchLowercase,Mapping=tex-text]{Gill Sans}
\setmonofont[Scale=MatchLowercase]{Andale Mono}
\frenchspacing


\begin{document}
................................
\backmatter
\printindex[nominum]
\printindex[rerum]
\end{document}

And this is the log file:

! Undefined control sequence.
\imki@decide ...ndexname \ifnum \imki@shellescape 
                                                  =\tw@ \@tempswatrue \fi \f...
l.7465 \printindex[nominum]

? ! Missing number, treated as zero.
<to be read again> 
                   =
l.7465 \printindex[nominum]

? ! Undefined control sequence.
\imki@decide ... \fi \fi \ifnum \imki@shellescape 
                                                  =\@ne \@tempswatrue \fi \f...
l.7465 \printindex[nominum]

? ! Missing number, treated as zero.
<to be read again> 
                   =
l.7465 \printindex[nominum]

? (./nominum.ind) [165] [166]
! Undefined control sequence.
\imki@decide ...ndexname \ifnum \imki@shellescape 
                                                  =\tw@ \@tempswatrue \fi \f...
l.7466 \printindex[rerum]

? ! Missing number, treated as zero.
<to be read again> 
                   =
l.7466 \printindex[rerum]

? ! Undefined control sequence.
\imki@decide ... \fi \fi \ifnum \imki@shellescape 
                                                  =\@ne \@tempswatrue \fi \f...
l.7466 \printindex[rerum]

? ! Missing number, treated as zero.
<to be read again> 
                   =
l.7466 \printindex[rerum]

? (./rerum.ind)

Package imakeidx Warning: Remember to run xelatex again after calling
(imakeidx)                `makeindex nominum.idx'
(imakeidx)                or call xelatex with -shell-escape.


Package imakeidx Warning: Remember to run xelatex again after calling
(imakeidx)                `makeindex rerum.idx'
(imakeidx)                or call xelatex with -shell-escape.

[167] (./medlyeM2.aux) )
Output written on medlyeM2.pdf (189 pages).
Transcript written on medlyeM2.log.