Erro ao enviar arquivo LaTeX para arXiv

Erro ao enviar arquivo LaTeX para arXiv

Estou tentando fazer upload do meu arquivo LaTeX no arXiv para envio. Infelizmente, estou recebendo esse erro.

Transcript written on research.log.

[verbose]: pdflatex 'research.tex' failed.
[verbose]: Removing (La)TeX AUX file called 'research.aux' (1599046895 >= 1599046895)
[verbose]: 'htex' is not a valid TeX format; will ignore.
[verbose]: TEXMFCNF is unset.
[verbose]: ~~~~~~~~~~~ Running htex for the first time ~~~~~~~~
[verbose]: Running: "(export HOME=/tmp PATH=/texlive/2016/bin/arch:/bin; cd /submissions/3350246/ && tex 'research.tex' < /dev/null)" 2>&1
[verbose]: This is TeX, Version 3.14159265 (TeX Live 2016) (preloaded format=tex)
(./research.tex
! Undefined control sequence.
l.1 \documentclass
[]{article}
?
! Emergency stop.
l.1 \documentclass
[]{article}
No pages of output.
Transcript written on research.log.

[verbose]: tex 'research.tex' failed.
[verbose]: TEXMFCNF is unset.
[verbose]: ~~~~~~~~~~~ Running tex for the first time ~~~~~~~~
[verbose]: Running: "(export HOME=/tmp PATH=/texlive/2016/bin/arch:/bin; cd /submissions/3350246/ && tex 'research.tex' < /dev/null)" 2>&1
[verbose]: This is TeX, Version 3.14159265 (TeX Live 2016) (preloaded format=tex)
(./research.tex
! Undefined control sequence.
l.1 \documentclass
[]{article}
?
! Emergency stop.
l.1 \documentclass
[]{article}
No pages of output.
Transcript written on research.log.

[verbose]: tex 'research.tex' failed.
[verbose]: We failed utterly to process the TeX file 'research.tex'
[error]: Unable to sucessfully process tex files.
*** AutoTeX ABORTING ***

[verbose]: AutoTeX returned error: Unable to sucessfully process tex files.

[verbose]: $autotex->process failed $@: $?: 0 $!: Inappropriate ioctl for device
[verbose]: Error running AutoTeX process:

O preâmbulo do meu LaTeX é assim:

\documentclass[]{article}
\date{}
\usepackage{cite}
\pdfoutput=1
\usepackage{amsmath, amssymb, float}
\usepackage{graphicx}
\usepackage[total={6.5in, 8in}]{geometry}
\renewcommand{\theequation}{\thesection.\arabic{equation}}

\usepackage{abstract}

\usepackage[affil-it]{authblk}
\usepackage[english]{babel}
\usepackage{blindtext}

\title{}

\author[1,*]{Devanshu Shekhar}
\author[2]{Satyananda Panda}

\affil[1]{Department of Physics, National Institute of Technology Calicut, Kerala, India}
\affil[2]{Department of Mathematics, National Institute of Technology Calicut, Kerala, India}
\affil[*]{Corresponding author: Devanshu Shekhar, [email protected]}

\begin{document}

Não consigo encontrar uma saída!

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