Hi,

compiling the following file via

  lualatex --interaction=batchmode mbsp

fails with an up-to-date TL2011:

\listfiles
\documentclass{article}
\usepackage{fontspec}
\begin{document}
A
\end{document}


The command

  >tlmgr show l3kernel l3packages l3experimental

shows for all packages

> cat-version: SVN 2607
> cat-date:    2011-08-17 22:57:44 +0200

Best regards,
Stephan Hennig


From the log file:

> ) (f:/texlive/2011/texmf-dist/tex/latex/tools/calc.sty
> Package: calc 2007/08/22 v4.3 Infix arithmetic (KKT,FJ)
> \calc@Acount=\count350
> \calc@Bcount=\count351
> \calc@Adimen=\dimen263
> \calc@Bdimen=\dimen264
> \calc@Askip=\skip262
> \calc@Bskip=\skip263
> LaTeX Info: Redefining \setlength on input line 76.
> LaTeX Info: Redefining \addtolength on input line 77.
> \calc@Ccount=\count352
> \calc@Cskip=\skip264
> )) (f:/texlive/2011/texmf-dist/tex/latex/l3packages/xparse/xparse.sty
> ! Undefined control sequence.
> <argument> \ExplFileName 
>                          
> l.57 ...e}{\ExplFileVersion}{\ExplFileDescription}
>                                                   
> The control sequence at the end of the top line
> of your error message was never \def'ed. If you have
> misspelled it (e.g., `\hobx'), type `I' and the correct
> spelling (e.g., `I\hbox'). Otherwise just continue,
> and I'll forget about whatever was undefined.
> 
> ! Undefined control sequence.
> <write> ...cls@pkg \space provides `\ExplFileName 
>                                                   '\@gobble \on@line .
> l.57 ...e}{\ExplFileVersion}{\ExplFileDescription}
>                                                   
> The control sequence at the end of the top line