[lltx] lualatex-math cannot find unpack function

[Martin Schröder]

2013/8/3 Wolfgang Jeltsch <g9ks157k at acme.softbase.org>:
> if I import both amsmath and lualatex-math, I get the following error
> message when LuaLaTeX tries to process \begin{document}:
>
> ! LuaTeX error
> .../texmf-dist/tex/lualatex/lualatex-math/lualatex-math.lua:46:
> attempt to call upvalue 'unpack' (a nil value)
> stack traceback:
>         .../texmf-dist/tex/lualatex/lualatex-math/lualatex-math.lua:46:
>         in function 'print_class_fam_slot'
>         [string "\directlua "]:1: in main chunk.
> \__lltxmath_set_mathchar:NN ...\int_eval:n {`#2})}
>                                                   \scan_stop:
>
> What is the reason for this?

Which version of LuaTeX do you use?

Best
   Martin

PS: IMHO this question is off-topic for this list; you should have
asked on e.g. http://tex.stackexchange.com/