I want to use arial font, but it doesn't generate any document. I'm using Texpad software. I tried with helvet package, but it doesn't work. Here's my code, maybe I'm not right. Can you help me?
\documentclass[10pt, a4paper]{article}
\usepackage{fontspec}
\setmainfont{Arial}
\usepackage{lipsum}
\usepackage[ampersand]{easylist}
\begin{document}
\tableofcontents
\newpage
\section{TITLE}
\section{TITLE}
\subsection{Subtitle}
\subsection{Subtitle}
\section{TITLE}
\lipsum
\subsection{Subtitle}
\subsection{Subtitle}
\subsubsection{Title}
\begin{easylist}
& Title
& Title
&& Subtitle
&&& Title
& Title
\end{easylist}
\subsubsection{Title}
\subsection{Subtitle}
\section{TITLE}
\subsection{Subtitle}
\subsubsection{Title}
\end{document}
xelatexYou can not usepdflatexorlatexas that can not use system fonts and thefontspecpackage. – David Carlisle Jun 25 '13 at 19:21aaaa \textbf{bbb} cccmakesbbbbold. – David Carlisle Jun 25 '13 at 19:31