I am working on texstudio.
\documentclass{article}
\usepackage{polyglossia}
\usepackage{fontspec}
\newfontfamily\arebicfont[sript=Arabic]{Amiri}
\begin{document}
ooooo
\end{document}
Fatal Package fontspec Error: The fontspec package requires either XeTeX or(fontspec) LuaTeX. \msg_fatal:nn {fontspec} {cannot-use-pdftex}

pdftexinstead ofxetexorluatexas required by the fontspec package. – ttnick Mar 17 '22 at 09:18