[XeTeX] polyglossia font warnings -- not sure what they mean

[Youssef Cherem]

Hi everyone,

When I compile my document,  xelatex has been returning  me  lots of 
warnings such as the one below:


"Package polyglossia Warning:  brazil at font is not defined on input line 
XXX".

Documents compile fine, but don't have a clue what all those warnings 
are all about, or why they appear at all.

Here's my preamble:

\documentclass[12pt, oneside]{scrbook}
\usepackage{scrpage2}
\usepackage{xunicode,xltxtra}
\usepackage{polyglossia}
\setmainlanguage{brazil}
\setotherlanguage[variant=american]{english}
\setotherlanguage{french}
\setotherlanguage{arabic}
\usepackage[dvipdfm, bookmarks, colorlinks]{hyperref}
\hypersetup{linkcolor=blue,citecolor=blue,filecolor=black,urlcolor=blue}
\setmainfont[Ligatures={Common, 
Rare},Numbers={OldStyle},Mapping=tex-text]{Arno Pro}
\setsansfont[Ligatures={Common},Mapping=tex-text]{Cronos Pro}
\usepackage{epigraph}
\usepackage[alf,abnt-full-initials=yes]{abntcite}
\usepackage{graphicx}
\usepackage{xcolor}
\usepackage[tocgraduated]{tocstyle}
\usetocstyle{nopagecolumn}
\setlength{\parskip}{0pt}
\usepackage{url}
\usepackage{booktabs}
\usepackage{rotating}
\usepackage{threeparttable}
\usepackage{subfig}
\usepackage{cclicenses}
\usepackage[toc,page]{appendix}
\renewcommand{\appendixtocname}{Apêndices}
\renewcommand{\appendixpagename}{Apêndices}
\usepackage{setspace}

\newenvironment{citacao}%
  {\singlespacing%
   \small
   \begin{list}{}{%
       \setlength{\listparindent}{0cm}%
       \setlength{\itemindent}{\listparindent}%
       \setlength{\rightmargin}{0cm}%
       \setlength{\leftmargin}{4cm}%
       \setlength{\parsep}{0pt}}%
    \item\relax}%
  {\end{list}}



\begin{document} ....

Thanks a lot,

Youssef Cherem