It's a bug in the unicode-math package. Here's an example:
------------------------------
\documentclass{article}
\usepackage{unicode-math}
\begin{document}
Test
\end{document}
--------------------------------
lualatex test2.tex
....
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! fontspec error: "font-not-found"
!
! The font "lmmath-regular.otf" cannot be found.
!
! See the fontspec documentation for further information.
!
! For immediate help type H <return>.
!...............................................
On Thu, Feb 21, 2013 at 7:07 PM, Bob Tennent <r...@cs.queensu.ca> wrote:
> >|! The font "lmmath-regular.otf" cannot be found.
>
> Perhaps because the file is named latinmodern-math.otf:
>
> texmf-dist/fonts/opentype/public/lm-math/latinmodern-math.otf
>
> Try
>
> \setmathfont{latinmodern-math.otf}
>
>
> Bob T.
>
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