This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020) (INITEX)  22 SEP 2025 22:57
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
 (/usr/share/texlive/texmf-dist/web2c/cp227.tcx)
***latex.ini
(/usr/share/texlive/texmf-dist/tex/latex/latexconfig/latex.ini
(/usr/share/texlive/texmf-dist/tex/generic/tex-ini-files/pdftexconfig.tex)
(/usr/share/texlive/texmf-dist/tex/latex/base/latex.ltx
(/usr/share/texlive/texmf-dist/tex/latex/base/texsys.cfg)
\openout15 = `texsys.aux'.


./texsys.aux found


\@currdir set to: ./.


Assuming \openin and \input 
have the same search path.


Defining UNIX/DOS style filename parser.

catcodes, registers,
\maxdimen=\dimen10
\hideskip=\skip10
\p@=\dimen11
\z@=\dimen12
\z@skip=\skip11
\voidb@x=\box10
 parameters,
\normalbaselineskip=\skip12
\normallineskip=\skip13
\normallineskiplimit=\dimen13
\interfootnotelinepenalty=\count23
\strutbox=\box11

LaTeX2e <2020-10-01> patch level 4
! LaTeX requires expl3.
<argument> \errmessage {LaTeX requires expl3}
                                             \batchmode \read -1 to \reserve...
l.1063   }
          
This error message was generated by an \errmessage
command, so I can't give any explicit help.
Pretend that you're Hercule Poirot: Examine all clues,
and deduce the truth by order and method.


! Emergency stop.
<read *> 
         
l.1063   }
          
*** (cannot \read from terminal in nonstop modes)

No pages of output.