Fonts Xeletex在Mac上找不到字体

我正在尝试使用polyglossia软件包和Xeletex来编译一些阿拉伯语文本。Xeletex似乎无法识别我安装的字体

\documentclass{article}

\usepackage{geometry}
\geometry{letterpaper}
\usepackage{setspace}

\usepackage{fontspec}
\usepackage{polyglossia}
\setmainlanguage{english}
\setotherlanguage{arabic}
\newfontfamily\arabicfont[Script = Arabic]{Scheherazade} 

\begin{document}

\begin{Arabic}

انطلقت الثورة الليبية منذ أكثر من سنة متوازية مع ثورات الربيع العربي الأخرى التي 

\end{Arabic}
\end{document}

当我尝试使用Xeletex编译此文件时，出现以下错误：

kpathsea: Running mktextfm Scheherazade/ICU
/usr/local/texlive/2012/texmf/web2c/mktexnam: Could not map source abbreviation I for ICU.
/usr/local/texlive/2012/texmf/web2c/mktexnam: Need to update /usr/local/texlive/2012/texmf-dist/fonts/map/fontname/special.map?
mktextfm: Running mf-nowin -progname=mf \mode:=ljfour; mag:=1; nonstopmode; input ICU
This is METAFONT, Version 2.718281 (TeX Live 2012)


kpathsea: Running mktexmf ICU
! I can't find file `ICU'.
<*> \mode:=ljfour; mag:=1; nonstopmode; input ICU

Please type another input file name
! Emergency stop.
<*> \mode:=ljfour; mag:=1; nonstopmode; input ICU

Transcript written on mfput.log.
grep: ICU.log: No such file or directory
mktextfm: `mf-nowin -progname=mf \mode:=ljfour; mag:=1; nonstopmode; input ICU' failed to make ICU.tfm.
kpathsea: Appending font creation commands to missfont.log.


!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! fontspec error: "font-not-found"
! 
! The font "Scheherazade" cannot be found.
! 
! See the fontspec documentation for further information.
! 
! For immediate help type H <return>.
!...............................................  

l.13 ...\arabicfont[Script = Arabic]{Scheherazade}

---

也无济于事。有什么建议吗？即使字体安装在我的系统上，它似乎也无法识别该字体。

结果表明，我需要将MacTex更新为MacTex2014，从而解决了此问题

\newfontfamily\arabicfont[Script = Arabic]{Scheherazade-R.ttf}