This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013) (format=pdflatex 2013.9.29)  2 MAR 2016 17:14
entering extended mode
 restricted \write18 enabled.
 file:line:error style messages enabled.
 %&-line parsing enabled.
**hal_prefs.tex
(./hal_prefs.tex
LaTeX2e <2011/06/27>
Babel <3.9f> and hyphenation patterns for 78 languages loaded.

./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:5: Undefined control sequence.
l.5 \usetheme
             {Rochester}
? 
./hal_prefs.tex:5: Emergency stop.
l.5 \usetheme
             {Rochester}
End of file on the terminal!

 
Here is how much of TeX's memory you used:
 5 strings out of 493315
 134 string characters out of 6137904
 52158 words of memory out of 5000000
 3557 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
 957 hyphenation exceptions out of 8191
 5i,0n,5p,46b,14s stack positions out of 5000i,500n,10000p,200000b,80000s
./hal_prefs.tex:5:  ==> Fatal error occurred, no output PDF file produced!