This is pdfTeX, Version 3.141592653-2.6-1.40.24 (TeX Live 2022) (preloaded format=pdflatex 2022.7.31)  15 MAY 2024 09:20
entering extended mode
 restricted \write18 enabled.
 file:line:error style messages enabled.
 %&-line parsing enabled.
**hal_prefs.tex
(./hal_prefs.tex
LaTeX2e <2021-11-15> patch level 1
L3 programming layer <2022-02-24>

./hal_prefs.tex:3: LaTeX Error: \usepackage before \documentclass.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.3 \usepackage{
                beamerthemesplit}
? 
./hal_prefs.tex:3: Emergency stop.
 ...                                              
                                                  
l.3 \usepackage{
                beamerthemesplit}
\usepackage may only appear in the document preamble, i.e.,
between \documentclass and \begin{document}.

 
Here is how much of TeX's memory you used:
 17 strings out of 478268
 533 string characters out of 5846347
 289381 words of memory out of 5000000
 18325 multiletter control sequences out of 15000+600000
 469259 words of font info for 28 fonts, out of 8000000 for 9000
 1141 hyphenation exceptions out of 8191
 13i,0n,12p,45b,14s stack positions out of 10000i,1000n,20000p,200000b,200000s
./hal_prefs.tex:3:  ==> Fatal error occurred, no output PDF file produced!