\begin{document} fehlt

\begin{document} fehlt

Ich habe gerade ein Manuskript beim APS Journal eingereicht revtex4-2, als plötzlich dieser Fehler auftritt. Leider weiß ich nicht, was die Hauptursache ist, daher füge ich meine Einleitung und die Protokolldatei bei. Ich bin für jede Hilfe wirklich dankbar. Vielen Dank im Voraus.

\documentclass[aps,prapplied,twocolumn,floatfix,footinbib,notitlepage,superscriptaddress,groupaddress,showpacs,showkeys]{revtex4-2}%,caption
\usepackage{graphicx,times,bm,bbm,bbold,amssymb,amsmath,amsfonts,dsfont,hyperref,mathrsfs,color,cancel}
\pdfminorversion=7
\usepackage{adjustbox}%,makecell
\usepackage{tabularx}
\usepackage{tabulary}
\usepackage[caption=false, justification=centerlast]{subfig}
\usepackage{dcolumn}
\usepackage{booktabs}
\usepackage{nicefrac}
\usepackage{etoolbox}
\usepackage{siunitx}
\apptocmd{\thebibliography}{\raggedright}{}{}
\usepackage{ragged2e} 
\usepackage{multirow}
\usepackage{textcomp,gensymb}
\usepackage[mathlines]{lineno}
\newcommand{\acot}{\cot^{-1}}
\begin{document}    
    \preprint{AIP/123-QED}
    \title[Sample title]{a new method}  
\author{}
\affiliation{}
    \begin{abstract} 
    \end{abstract}
    \keywords{}
    \maketitle

    \section{Introduction}\label{sec:introduction}
    kjh h ih ajkdh akshdj xnhsdjxn iosp;'., bgsajskl

\providecommand{\noopsort}[1]{}\providecommand{\singleletter}[1]{#1}%
    
    \end{document}

und die Logdatei

This is pdfTeX, Version 3.141592653-2.6-1.40.24 (MiKTeX 22.8.28) (preloaded format=pdflatex 2022.10.13) 13 OCT 2022 18:32
entering extended mode
restricted \write18 enabled.
%&-line parsing enabled.
**./aipsamp.tex
(aipsamp.tex
LaTeX2e <2022-06-01> patch level 5
L3 programming layer <2022-09-28>
(C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/revtex\revtex4-2.cls

! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
... 
l.1 C
lass revtex4-2 Warning: No type size specified, using default 10.
You're in trouble here. Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.

Missing character: There is no C in font nullfont!
Missing character: There is no l in font nullfont!
…..

Overfull \hbox (20.0pt too wide) in paragraph at lines 1--2
[]
[]


! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
... 
l.3 (
C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/revtex\aps10pt4...

You're in trouble here. Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.

Missing character: There is no ( in font nullfont!
Missing character: There is no C in font nullfont!
Missing character: There is no : in font nullfont!
! Undefined control sequence.
l.3 (C:\Users
\Sara\AppData\Local\Programs\MiKTeX\tex/latex/revtex\aps10pt4...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.3 (C:\Users\Sara


Missing character: There is no / in font nullfont!
Missing character: There is no l in font nullfont!
! Undefined control sequence.
l.3 ...\Local\Programs\MiKTeX\tex/latex/revtex\aps
10pt4-2.rtx
Missing character: There is no 1 in font nullfont!
!
! Undefined control sequence.
l.7 ) (C:\Users
\Sara\AppData\Local\Programs\MiKTeX\tex/latex/textcase\text...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.7 ) (C:\Users\Sara
\AppData\Local\Programs\MiKTeX\tex/latex/textcase\text...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.7 ) (C:\Users\Sara\AppData
\Local\Programs\MiKTeX\tex/latex/textcase\text...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.

Missing character: There is no : in font nullfont!
! Undefined control sequence.
l.11 ) (C:\Users
\Sara\AppData\Local\Programs\MiKTeX\tex/latex/url\url.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.11 ) (C:\Users\Sara
\AppData\Local\Programs\MiKTeX\tex/latex/url\url.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.11 ) (C:\Users\Sara\AppData
\Local\Programs\MiKTeX\tex/latex/url\url.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.11 ) (C:\Users\Sara\AppData\Local
\Programs\MiKTeX\tex/latex/url\url.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.11 ) (C:\Users\Sara\AppData\Local\Programs
\MiKTeX\tex/latex/url\url.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.11 ...Users\Sara\AppData\Local\Programs\MiKTeX
\tex/latex/url\url.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.



Missing character: There is no y in font nullfont!
! Undefined control sequence.
l.12 \Urlmuskip
=\muskip16
Missing character: There is no = in font nullfont!
! Missing number, treated as zero.
<to be read again> 
P
l.13 P
ackage: url 2013/09/16 ver 3.4 Verb mode for urls, etc.
The unit of measurement in math glue must be mu.
To recover gracefully from this error, it's best to
delete the erroneous units; e.g., type `2' to delete
two letters. (See Chapter 27 of The TeXbook.)

Missing character: There is no C in font nullfont!
Missing character: There is no : in font nullfont!
! Undefined control sequence.
l.15 (C:\Users
\Sara\AppData\Local\Programs\MiKTeX\tex/latex/natbib\natbib.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.15 (C:\Users\Sara
\AppData\Local\Programs\MiKTeX\tex/latex/natbib\natbib.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no b in font nullfont!
! Undefined control sequence.
l.15 ...al\Programs\MiKTeX\tex/latex/natbib\natbib
.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no . in font nullfont!
!
Missing character: There is no ) in font nullfont!
! Undefined control sequence.
l.17 \bibhang
=\skip49
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no = in font nullfont!
! Undefined control sequence.
l.18 \bibsep
=\skip50
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no L in font nullfont!
\citation{o}
! Undefined control sequence.
<write> ...: Citation `\@citeb ' on page \thepage 
\space undefined\on@line .
l.19 LaTeX Info: Redefining \cite o
n input line 694.
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.


LaTeX Warning: Citation `o' on page undefined on input line 19.

Missing character: There is no ] in font nullfont!
! Undefined control sequence.
l.20 \c@NAT@ctr
=\count266
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no = in font nullfont!
! Missing number, treated as zero.
<to be read again> 
)
l.21 )
A number should have been here; I inserted `0'.
(If you can't figure out why I needed to see a number,
look up `weird error' in the index to The TeXbook.)

Missing character: There is no ) in font nullfont!
!
Missing character: There is no s in font nullfont!
! Undefined control sequence.
l.22 ...x4-2 Info: Repairing natbib's \BibitemShut
on input line 7665.
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no o in font nullfont!
Missing character: There is no n in font nullfont!
Missing character: There is no i in font nullfont!
Missing character: There is no n in font nullfont!
Missing character: There is no p in font nullfont!
Missing character: There is no u in font nullfont!
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Missing character: There is no l in font nullfont!
Missing character: There is no i in font nullfont!
Missing character: There is no n in font nullfont!
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Missing character: There is no 7 in font nullfont!
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Overfull \hbox (20.0pt too wide) in paragraph at lines 3--23
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Overfull \hbox (5.43053pt too wide) in paragraph at lines 3--23
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! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
... 
l.24 (
C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/revtex\revsymb...

You're in trouble here. Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.

Missing character: There is no ( in font nullfont!
Missing character: There is no C in font nullfont!
Missing character: There is no : in font nullfont!
! Undefined control sequence.
l.24 (C:\Users
\Sara\AppData\Local\Programs\MiKTeX\tex/latex/revtex\revsymb...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.24 (C:\Users\Sara
\AppData\Local\Programs\MiKTeX\tex/latex/revtex\revsymb...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.24 (C:\Users\Sara\AppData
\Local\Programs\MiKTeX\tex/latex/revtex\revsymb...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.24 (C:\Users\Sara\AppData\Local
\Programs\MiKTeX\tex/latex/revtex\revsymb...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.


Missing character: There is no x in font nullfont!
! Undefined control sequence.
l.24 ...l\Programs\MiKTeX\tex/latex/revtex\revsymb
4-2.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no 4 in font nullfont!

l.27 LaTeX Info: Redefining \REV@mathfrak
on input line 128.
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no o in font nullfont!
Missing character: There is no : in font nullfont!
! Undefined control sequence.
l.29 (C:\Users
\Sara\AppData\Local\Programs\MiKTeX\tex/latex/graphics\graph...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.29 (C:\Users\Sara
\AppData\Local\Programs\MiKTeX\tex/latex/graphics\graph...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
l.29 ...s\Sara\AppData\Local\Programs\MiKTeX\tex
/latex/graphics\graphicx.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no / in font nullfont!
!
Missing character: There is no s in font nullfont!
! Undefined control sequence.
l.29 ...rograms\MiKTeX\tex/latex/graphics\graphicx
.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no . in font nullfont!
Missing character: There is no ) in font nullfont!

Overfull \hbox (20.0pt too wide) in paragraph at lines 24--31
[]
[]


! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
... 
l.32 (
C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/graphics\keyva...

You're in trouble here. Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.

Missing character: There is no ( in font nullfont!
Missing character: There is no C in font nullfont!
Missing character: There is no : in font nullfont!
! Undefined control sequence.
l.32 (C:\Users
\Sara\AppData\Local\Programs\MiKTeX\tex/latex/graphics\keyva...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.


Missing character: There is no c in font nullfont!
Missing character: There is no s in font nullfont!
! Undefined control sequence.
l.32 ...\Programs\MiKTeX\tex/latex/graphics\keyval
.sty
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no . in font nullfont!
!
Missing character: There is no e in font nullfont!
! Undefined control sequence.
l.34 \KV@toks@
=\toks18
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Missing character: There is no = in font nullfont!
! Missing { inserted.
<to be read again> 
)
l.35 )
A left brace was mandatory here, so I've put one in.
You might want to delete and/or insert some corrections
so that I will find a matching right brace soon.
(If you're confused by all this, try typing `I}' now.)

)
Runaway text?
) (C:\Users \Sara \AppData \Local \Programs \MiKTeX \tex /latex/gra\ETC.
! File ended while scanning text of \toks.
<inserted text> 
}
l.2 \usepackage
{graphicx,times,bm,bbm,bbold,amssymb,amsmath,amsfonts,dsfont,...
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.

)
Runaway text?
) (C:\Users \Sara \AppData \Local \Programs \MiKTeX \tex /latex/gra\ETC.
! File ended while scanning text of \toks.
<inserted text> 
}
<*> ./aipsamp.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.
<*> ./aipsamp.tex
*** (job aborted, no legal \end found)

Here is how much of TeX's memory you used:
1669 strings out of 475385
21889 string characters out of 2776434
419191 words of memory out of 3000000
23144 multiletter control sequences out of 15000+600000
469567 words of font info for 29 fonts, out of 8000000 for 9000
1141 hyphenation exceptions out of 8191
33i,2n,37p,279b,93s stack positions out of 10000i,1000n,20000p,200000b,80000s
! ==> Fatal error occurred, no output PDF file produced!


Und

Class revtex4-2 Warning: No type size specified, using default 10.

(C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/revtex\aps10pt4-2.rtx
File: aps10pt4-2 2020/10/03 4.2e (https://journals.aps.org/revtex/ for document
ation)
Class revtex4-2 Info: RevTeX pointsize 10pt selected on input line 39.
) (C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/textcase\textcase.st
y
Package: textcase 2022/06/12 v1.02 Text only upper/lower case changing (DPC)
Package textcase Info: Defining Legacy names on input line 20.
) (C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/url\url.sty
\Urlmuskip=\muskip16
Package: url 2013/09/16  ver 3.4  Verb mode for urls, etc.
)
(C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/natbib\natbib.sty
Package: natbib 2010/09/13 8.31b (PWD, AO)
\bibhang=\skip49
\bibsep=\skip50
LaTeX Info: Redefining \cite on input line 694.
\c@NAT@ctr=\count266
)
Class revtex4-2 Info: Repairing natbib's \BibitemShut on input line 7665.

(C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/revtex\revsymb4-2.sty
Package: revsymb4-2 2020/10/03 4.2e (https://journals.aps.org/revtex/ for docum
entation)
LaTeX Info: Redefining \REV@mathfrak on input line 128.
))
(C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/graphics\graphicx.sty
Package: graphicx 2021/09/16 v1.2d Enhanced LaTeX Graphics (DPC,SPQR)

(C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/graphics\keyval.sty
Package: keyval 2022/05/29 v1.15 key=value parser (DPC)
\KV@toks@=\toks18
)
(C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/graphics\graphics.sty
Package: graphics 2022/03/10 v1.4e Standard LaTeX Graphics (DPC,SPQR)

(C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/graphics\trig.sty
Package: trig 2021/08/11 v1.11 sin cos tan (DPC)
)
(C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/graphics-cfg\graphics.
cfg
File: graphics.cfg 2016/06/04 v1.11 sample graphics configuration
)
Package graphics Info: Driver file: pdftex.def on input line 107.

(C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/graphics-def\pdftex.de
f
File: pdftex.def 2020/10/05 v1.2a Graphics/color driver for pdftex
))
\Gin@req@height=\dimen138
\Gin@req@width=\dimen139
) (C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/psnfss\times.sty
Package: times 2020/03/25 PSNFSS-v9.3 (SPQR) 

Antwort1

Die Protokolldatei beschwert sich über Text, der in der Präambel gesetzt wurde ("fehlendes Begin-Dokument") und bevor die Schriftarten eingerichtet wurden ("Nullfont")

Missing character: There is no C in font nullfont!
Missing character: There is no l in font nullfont!

bedeutet konkret, dass Zeile 1 revtex4-2.clsText enthält Cl... , der nicht darin enthalten sein sollte.

Ihre spätere Bearbeitung bestätigt dies und zeigt, dass die Datei beginnt

Class revtex4-2 Warning: No type size specified, using default 10.

(C:\Users\Sara\AppData\Local\Programs\MiKTeX\tex/latex/revtex\aps10pt4-2.rtx
File: aps10pt4-2 2020/10/03 4.2e (https://journals.aps.org/revtex/ for document
ation)

Dies ist eindeutig eine Protokolldatei eines früheren Laufs, den Sie durchgeführt haben. Anstatt jedoch darin enthalten zu sein, somefile.logwurde sie als revtex4-2.clssolche gespeichert, wodurch der echte Revtex-Code von Ihrem System entfernt wurde.

Sie müssen diese Datei löschen und dann mit der Miktex-Konsole eine Neuinstallation von Revtex erzwingen.

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