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My minimum code necessary to replicate the error is just three lines:

\input{report_template.cls}

\begin{document}

\end{document}

I suspect its a problem with the "report_template.cls" however, this is the template we are required to use. Is there an easy work around for this type of error?

Error output in Overleaf:

Extra \endgroup.

\document ->\endgroup 
                      \document@inithook \true@sw {}\UseOneTimeHook {begindo...
l.3 \begin{document}
                    

LaTeX Error: Missing \begin{document}.

No \begin{document} command was found. Make sure you have included \begin{document} in your preamble, and that your main document is set correctly.                                              
                                                  
l.3 \begin{document}
                    

The template ".cls" file contains the following code:

\NeedsTeXFormat{LaTeX2e} 

%\DeclareOption*{\PassOptionsToClass{\CurrentOption}{report}}
%\ProcessOptions\relax

%\LoadClass[a4paper,11pt]{report}

\documentclass[%
reprint,
amsmath,amssymb,
aps,
floatfix
]{revtex4-2}

\RequirePackage{PRL-lab}
\usepackage[caption=false]{subfig}
\usepackage{natbib}
\bibliographystyle{WLreferences}

\endinput
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  • Not without knowing what's in report_template.cls! Dec 14, 2021 at 13:49
  • 5
    Erh, one does not \input a class try \documentclass{report_template}
    – daleif
    Dec 14, 2021 at 13:49
  • please provide a test that produces the error, the above produces ! LaTeX Error: File `report_template.cls' not found. but using \input with a .cls file looks wrong. Dec 14, 2021 at 14:19
  • @DavidCarlisle I have fixed my post to include the error message
    – physBa
    Dec 14, 2021 at 14:26
  • That is still no use to anyone trying to help. why are you using \input with a .cls file? that is almost certainly wrong. every other .cls file in the tex distribution is used as \documentclass{file} not \input{file.cls} But if you want people to reproduce the error as you say in the question you need to show the report_template.cls file. Dec 14, 2021 at 14:34

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