Note, this is not a problem in MkIV, just LMTX On 10/9/2021 15:53, Rik Kabel via ntg-context wrote:

Error with 20211008 ConTeXt:

ConTeXt  ver: 2021.10.08 20:18 LMTX fmt: 2021.10.9  int: english/english

...

tex error       > tex error on line 1 in file ./mmm.tex: Undefined control sequence \??markingfilter

<argument>     \csname \??markingfilter     \v!default \endcsname {chapter} <macro> \sectionheadmarkingtitle     #1#2->\clf_markingtitle {#1}{#2     } <macro> \strc_markings_get_yes     ...rking \begincsname \??markingclass #1\endcsname {#2}{#3}}\fi \orelse \ifparameter #2\or \markingcommand {#1}{\csname \??markingfilter #2\endcsname {#1}}\else \markingcommand {#1}{\csname \??markingfilter \v!default \endcsname {#1}}     \fi \endgroup ... <to be read again>

    \fi <macro> \page_layouts_process_element_indeed     ...andcolor #1#2\begincsname \??layouttextstrut \layoutelementparameter \c!strut \endcsname \ignorecrlf \edef \p_width {\layoutelementparameter #3}\ifempty \p_width \else \expandafter \page_layouts_process_element_limited \fi \p_text     \endgroup <macro> \currentlayoutelement     ...kern -\makeupwidth \fi \letfromlayoutelementparameter \p_text \c!righttext \ifempty \p_text \kern \makeupwidth \else \hbox to \makeupwidth \bgroup \hss \page_layouts_process_element_indeed \c!rightstyle \c!rightcolor \c!rightwidth     \egroup \fi  ...

    \stoptext

 1 >>  2     %\setupheadertexts [][][{\it\getmarking[chapter]}][] % fails  3     \setupheadertexts [][][{\getmarking[chapter]}][] % fails  4     %\setupheadertexts [][][\getmarking[chapter]][] % succeeds

MWE to create. Note that the \it is not necessary to trigger the error, just the braces.

%\setupheadertexts [][][{\it\getmarking[chapter]}][]  % fails \setupheadertexts [][][{\getmarking[chapter]}][]     % fails %\setupheadertexts [][][\getmarking[chapter]][]       % succeeds

\starttext

\chapter{abc} abc \chapter{def} def \stoptext

-- Rik

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