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<font face="Calibri">If in the MWE I drop the equation, and don't
specify the math font (below), still get the error, which seems to
point to fontspec as the culprit. Still get the following error:<br>
<br>
<br>
luaotfload | Font names database loaded:
C:/Users/egc/AppData/Local/MiKTeX/2.9/<br>
luatex-cache/generic/names/otfl-names.lua(load:
C:/Users/egc/AppData/Local/MiKT<br>
eX/2.9/luatex-cache/generic/fonts/otf/temp-xits-regular.lua)<br>
! LuaTeX error ...les (x86)/MiKTeX
2.9/tex/latex/fontspec/fontspec.lua:45: atte<br>
mpt to call upvalue 'check_script' (a nil value)<br>
stack traceback:<br>
...les (x86)/MiKTeX 2.9/tex/latex/fontspec/fontspec.lua:45: in
function 'check<br>
_ot_script'<br>
<\directlua >:1: in main chunk.<br>
\fontspec_check_script:nTF ...ontspec_font","#1")}<br>
\if@tempswa
\prg_return_tr...<br>
l.4 \setmainfont{XITS}<br>
<br>
? <br>
<br>
Process has been terminated ...<br>
<br>
</font><br>
<blockquote cite="mid:519CD1CA.4040906@gmail.com" type="cite"><font
face="Calibri"> <br>
<br>
\documentclass[11pt,letterpaper]{article}<br>
<br>
\usepackage{fontspec}<br>
\setmainfont{XITS}<br>
%\usepackage{unicode-math}<br>
% \setmathfont{XITS Math}<br>
<br>
\begin{document}<br>
<br>
Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Praesent in tincidunt nulla. Donec quis laoreet est. Aenean
vitae est felis, a venenatis magna. Mauris semper bibendum
vulputate. Etiam bibendum quam ut erat rutrum consequat.<br>
<br>
%\begin{equation}<br>
%\frac{dN}{dt}=rN\left(1-\frac{N}{K}\right)<br>
%\end{equation}<br>
<br>
\end{document} <br>
<br>
<br>
<br>
<br>
</font> </blockquote>
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