preamble.log

This is pdfTeX, Version 3.14159265-2.6-1.40.18 (TeX Live 2017) (preloaded format=pdflatex 2017.5.23)  29 JUN 2018 13:50
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**preamble.tex
(./preamble.tex
LaTeX2e <2017-04-15>
Babel <3.10> and hyphenation patterns for 84 language(s) loaded.

! LaTeX Error: \usepackage before \documentclass.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.1 \usepackage{
                booktabs}
\usepackage may only appear in the document preamble, i.e.,
between \documentclass and \begin{document}.


! LaTeX Error: \usepackage before \documentclass.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.2 \usepackage{
                amsthm}
\usepackage may only appear in the document preamble, i.e.,
between \documentclass and \begin{document}.

)
Runaway argument?
{\boldsymbol {\theta } 
! File ended while scanning use of \@argdef.
<inserted text> 
                \par 
<*> preamble.tex
                
I suspect you have forgotten a `}', causing me
to read past where you wanted me to stop.
I'll try to recover; but if the error is serious,
you'd better type `E' or `X' now and fix your file.

! Emergency stop.
<*> preamble.tex
                
*** (job aborted, no legal \end found)

 
Here is how much of TeX's memory you used:
 10 strings out of 492995
 185 string characters out of 6132704
 54074 words of memory out of 5000000
 3663 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
 1141 hyphenation exceptions out of 8191
 5i,0n,5p,55b,14s stack positions out of 5000i,500n,10000p,200000b,80000s
!  ==> Fatal error occurred, no output PDF file produced!