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This is my document with some Urdu text between English. 

    \documentclass[smallextended]{svjour3} 
    \usepackage{xltxtra}
    \usepackage{fontspec}
    \usepackage{polyglossia}
    \setmainlanguage{english}
    \setotherlanguage{urdu}
    \newfontfamily\urdufont[Script=Arabic,Language=Urdu,Scale=1.5]{Jameel Noori Nastaleeq}  
    \begin{document}
    \title{Title goes here}
    \maketitle
    \section{Introduction}
    English text here \texturdu{ اردو ٹیکسٹ} English text here
    \end{document}

When I compile with LuaLaTeX or XeLaTeX it gives the following error:

! Undefined control sequence.
<argument> \LaTeX3 error: 
Erroneous variable \c__fontspec_shape_n_n_tl used!
l.3530 \emfontdeclare{ \emshape, \eminnershape }

?
Alan Munn
  • 218,180
tayyaba
  • 43
  • if you put that error message into this site's search you will find many answers including https://tex.stackexchange.com/questions/395163/error-in-fontspec you need to use your package manager and update fontspec and expl3 to matching versions – David Carlisle Oct 25 '17 at 11:34

0 Answers0