In this MWE:

\chapter{Chapter test}

I got error: Incompatible list can't be unboxed. \part{Test}

With book class - no errors.

Should I play with pagestyles for part?

  • No errors with the memoir class either. Mar 17, 2022 at 17:39
  • Full error in log: ! Incompatible list can't be unboxed. <argument> \@tempboxa l.4 \part{Test} Sorry, Pandora. (You sneaky devil.) I refuse to unbox an \hbox in vertical mode or vice versa. And I can't open any boxes in math mode.
    – Elisey
    Mar 17, 2022 at 18:04
  • Interestingly other people seem not to have had the same issue: tex.stackexchange.com/questions/569858
    – Ingmar
    Mar 17, 2022 at 19:00
  • @Ingmar No, with \part{} error again in code from this link.
    – Elisey
    Mar 17, 2022 at 20:27

1 Answer 1


I found this piece of code from scrbook.cls: (str:194-196)
KOMAScriptVersion{2021/11/13 v3.35 KOMA-Script}


and if I comment \newpage - error disappear.


But \newpage still needed :-) and I can add it by hand after \part{}.
Or modify this code:

  \vbox to\z@{\use@preamble{#1@u}\vss}%
  \@tempskipa=\glueexpr\csname scr@#1@afterskip\endcsname\relax\relax
  \cleardoubleoddpage%   <---- ADD
  \thispagestyle{empty}% <---- ADD

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