This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013) (format=pdflatex 2013.9.29)  2 MAR 2017 15:06
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**hal_prefs_pdf_2017.tex
(./hal_prefs_pdf_2017.tex
LaTeX2e <2011/06/27>
Babel <3.9f> and hyphenation patterns for 78 languages loaded.

./hal_prefs_pdf_2017.tex:7: LaTeX Error: \usepackage before \documentclass.

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 ...                                              
                                                  
l.7 \usepackage{
                graphicx}
? 

./hal_prefs_pdf_2017.tex:8: LaTeX Error: \usepackage before \documentclass.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.8 \usepackage{
                amsmath}
? 

./hal_prefs_pdf_2017.tex:9: LaTeX Error: \usepackage before \documentclass.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.9 \usepackage{
                amssymb}
? 
./hal_prefs_pdf_2017.tex:9: Emergency stop.
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l.9 \usepackage{
                amssymb}
\usepackage may only appear in the document preamble, i.e.,
between \documentclass and \begin{document}.

 
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./hal_prefs_pdf_2017.tex:9:  ==> Fatal error occurred, no output PDF file produ
ced!