preamble.log

This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018) (preloaded format=pdflatex 2018.7.21)  21 JUL 2018 00:54
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**preamble.tex
(./preamble.tex
LaTeX2e <2018-04-01> patch level 5

! 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{
                longtable}
\usepackage may only appear in the document preamble, i.e.,
between \documentclass and \begin{document}.

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

 
Here is how much of TeX's memory you used:
 5 strings out of 494587
 131 string characters out of 6176687
 51883 words of memory out of 5000000
 3741 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
 14 hyphenation exceptions out of 8191
 5i,0n,5p,39b,14s stack positions out of 5000i,500n,10000p,200000b,80000s
!  ==> Fatal error occurred, no output PDF file produced!