Please paste line no. 238 of your input file.

On Tue, Jan 16, 2024 at 4:11 PM Ursula Hermann <ursula.hermann@univie.ac.at> wrote:

Dear List,

 

After Compiling in the Folder:

 

This is LuaMetaTeX, Version 2.10.11 initex
(C:/Users/Hermann/Downloads/context-mswin/tex/texmf-context/tex/context/base/mkxl/cont-
en.mkxl(context.mkxl(syst-ini.mkxl
! Undefined control sequence.
<line 3.238>
  \immutable\defcsname\tocharacter
  \tabasciicode      \endcsname {\ } % \def\^^I{\ } tab