I am facing weird problems trying to load the siunitx package. Version 2.7l is installed, all compulsory packages as well. I produced a minimal example where the same error occurs:

\documentclass[a4paper, 12pt, oneside, headsepline, ngerman, openany, headings=small]{scrbook}


        tight-spacing       = true,
        group-digits        = false ,
        input-signs     = ,
        input-symbols       = ( ) [ ] - + *,
        input-open-uncertainty  = ,
        input-close-uncertainty = ,
        table-align-text-post   = false




The error message tells me there is something wrong with the style file of the package:

! Undefined control sequence.
<argument> \seq_const_from_clist:Nn
\c__siunitx_old_options_seq {addsign,all...
l.258 }
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.
    <argument> ...list:Nn \c__siunitx_old_options_seq
    l.258 }

! LaTeX Error: Missing \begin{document}.
    See the LaTeX manual or LaTeX Companion for explanation.
    Type H <return> for immediate help.
    l.258 }

Maybe someone has an idea how I can handle it. Thank you in advance.

  • 1
    I can run your code without problems (updated last week, MiKTeX, Win10). Maybe try to update your system again. As a last resort, deinstall and reinstall. Mar 20, 2018 at 18:58
  • Almost certainly you have an old version of l3kernel: are you using MiKTeX?
    – Joseph Wright
    Mar 20, 2018 at 19:03
  • The code works for me without problem on a fully updated MikTeX distribution on Windows 10. Your siunitx is up to date, so probably one of the l3 packages is outdated. Have you tried an update?
    – moewe
    Mar 20, 2018 at 19:40
  • 1
    Thank you! I reinstalled MiKTeX and after some adaption the code runs finally. Thank you all very very much
    – marieke
    Mar 20, 2018 at 20:09
  • Unrelated to your problem, you might consider newpxmath as a replacement for mathpazo. Or even unicode-math with \setmainfont{TeX Gyre Pagella} and \setmathfont[Scale=MatchUppercase]{Asana Math}.
    – Davislor
    Jul 29, 2018 at 2:58

1 Answer 1


With the intention of adding more details, I verified that this is a version compatibility problem with Miktex and the siunitx package that is imported in the latest version. In my case the problem was with Miktex-2.9.6361 and it was fixed by installing Miktex-2.9.6643, which has important changes like how to manage packages and updates that is now done through a single interface called Miktex console.

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