This is pdfTeX, Version 3.14159265-2.6-1.40.18 (TeX Live 2017/Debian) (preloaded format=pdflatex 2018.10.13)  16 DEC 2020 11:24
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**content.tex
(./content.tex
LaTeX2e <2017-04-15>
Babel <3.18> and hyphenation patterns for 84 language(s) loaded.

! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.4 \begin{frame}[
                  t,plain]
? 
! Emergency stop.
 ...                                              
                                                  
l.4 \begin{frame}[
                  t,plain]
You're in trouble here.  Try typing  <return>  to proceed.
If that doesn't work, type  X <return>  to quit.

 
Here is how much of TeX's memory you used:
 6 strings out of 492982
 267 string characters out of 6134895
 53913 words of memory out of 5000000
 3671 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
 7i,0n,5p,57b,20s stack positions out of 5000i,500n,10000p,200000b,80000s
!  ==> Fatal error occurred, no output PDF file produced!