我将 MikTeX 发行版从 2.9 更新到 21.6。之前编译时没有任何问题的简单文件：
\documentclass[aps,preprint,nofootinbib,floatfix]{revtex4}
\usepackage{epsfig}
\usepackage{graphicx}
%
\begin{document}
\title{\textbf{Width }}
\author{H}
\email{h@aps}
\affiliation{Es}
\author{A}
\email{v@aps}
\affiliation{Dep}
\date{\today}
\begin{abstract}
We study
\end{abstract}
\maketitle
\noindent
\section{Introduction}
%
During
%
\end{document}
现在产生此错误消息
! Extra \endgroup.
\document ->\endgroup
\init@documenthook \set@typesize@hook \normalsize \set...
l.6 \begin{document}
情况很混乱，但我认为最糟糕的时期已经过去了。
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.6 \begin{document}
You're in trouble here. Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.
我已阅读所有关于类似问题的帖子，但找不到解决方法。有什么办法吗？谢谢
这是日志文件
This is pdfTeX, Version 3.141592653-2.6-1.40.22 (MiKTeX 21.6) (preloaded format=latex 2021.6.25) 25 JUN 2021 12:42
entering extended mode
**./Width.tex
(Width.tex
LaTeX2e <2021-06-01> patch level 1
L3 programming layer <2021-06-18>
(C:\Users\Alfredo\AppData\Roaming\MiKTeX\tex/latex/revtex4\revtex4.cls
Document Class: revtex4 2001/08/03 v4.0 (http://publish.aps.org/revtex4/ for do
cumentation)
Copyright (c) 2001 The American Physical Society.
mailto:[email protected]
Licensed under the LPPL:
http://www.ctan.org/tex-archive/macros/latex/base/lppl.txt
Arthur Ogawa <[email protected]>
Based on work by David Carlisle <[email protected]>.
ltxutil: portions licensed from W. E. Baxter ([email protected])
Class revtex4 Info: Repairing broken LateX \@sect on input line 596.
\intertabularlinepenalty=\count182
\@tbpen=\count183
\@arstrutbox@hline=\box50
Class revtex4 Info: Repairing broken LaTeX \@xbitor on input line 1610.
ltxgrid: portions licensed from W. E. Baxter ([email protected])
\c@linecount=\count184
\output=\toks16
\@protection@box=\box51
\@topmark@saved=\toks17
\footins@saved=\box52
\pagesofar=\box53
\footbox=\box54
\pagegrid@col=\count185
Class revtex4 Info: Incorporating package {textcase} [1998/11/12 v0.06 Text on
ly upper/lower case changing (DPC)]. on input line 3682.
(C:\Program Files\MiKTeX\tex/latex/url\url.sty
\Urlmuskip=\muskip16
Package: url 2013/09/16 ver 3.4 Verb mode for urls, etc.
)
\c@affil=\count186
\absbox=\box55
\c@part=\count187
\c@section=\count188
\c@subsection=\count189
\c@subsubsection=\count190
\c@paragraph=\count191
\c@subparagraph=\count192
\abovecaptionskip=\skip47
\belowcaptionskip=\skip48
\c@figure=\count193
\c@table=\count194
(C:\Users\Alfredo\AppData\Roaming\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=\count195
)
\widetext@top=\box56
\widetext@bot=\box57
(C:\Users\Alfredo\AppData\Roaming\MiKTeX\tex/latex/revtex4\revsymb.sty
Package: revsymb 2001/08/03 v4.0 (http://publish.aps.org/revtex4/ for documenta
tion)
LaTeX Info: Redefining \REV@mathfrak on input line 118.
))
(C:\Users\Alfredo\AppData\Roaming\MiKTeX\tex/latex/revtex4\aps.rtx
File: aps.rtx 2001/08/03 v4.0 (http://publish.aps.org/revtex4/ for documentatio
n)
)
(C:\Users\Alfredo\AppData\Roaming\MiKTeX\tex/latex/revtex4\12pt.rtx
File: 12pt.rtx 2001/08/03 v4.0 (http://publish.aps.org/revtex4/ for documentati
on)
)
(C:\Program Files\MiKTeX\tex/latex/graphics\epsfig.sty
Package: epsfig 2017/06/25 v1.7b (e)psfig emulation (SPQR)
(C:\Program Files\MiKTeX\tex/latex/graphics\graphicx.sty
Package: graphicx 2020/12/05 v1.2c Enhanced LaTeX Graphics (DPC,SPQR)
(C:\Program Files\MiKTeX\tex/latex/graphics\keyval.sty
Package: keyval 2014/10/28 v1.15 key=value parser (DPC)
\KV@toks@=\toks18
)
(C:\Program Files\MiKTeX\tex/latex/graphics\graphics.sty
Package: graphics 2021/03/04 v1.4d Standard LaTeX Graphics (DPC,SPQR)
(C:\Program Files\MiKTeX\tex/latex/graphics\trig.sty
Package: trig 2016/01/03 v1.10 sin cos tan (DPC)
)
(C:\Program Files\MiKTeX\tex/latex/graphics-cfg\graphics.cfg
File: graphics.cfg 2016/06/04 v1.11 sample graphics configuration
)
Package graphics Info: Driver file: dvips.def on input line 107.
(C:\Program Files\MiKTeX\tex/latex/graphics-def\dvips.def
File: dvips.def 2017/06/20 v3.1d Graphics/color driver for dvips
))
\Gin@req@height=\dimen138
\Gin@req@width=\dimen139
)
\epsfxsize=\dimen140
\epsfysize=\dimen141
)
! Extra \endgroup.
\document ->\endgroup
\init@documenthook \set@typesize@hook \normalsize \set...
l.6 \begin{document}
Things are pretty mixed up, but I think the worst is over.
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.6 \begin{document}
You're in trouble here. Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.
(C:\Program Files\MiKTeX\tex/latex/l3backend\l3backend-dvips.def
File: l3backend-dvips.def 2021-05-07 L3 backend support: dvips
\l__pdf_internal_box=\box58
\g__pdf_backend_object_int=\count196
\l__pdf_backend_content_box=\box59
\l__pdf_backend_model_box=\box60
\g__pdf_backend_annotation_int=\count197
\g__pdf_backend_link_int=\count198
\g__pdf_backend_link_sf_int=\count199
) (Width.aux)
\openout1 = `Width.aux'.
LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 6.
LaTeX Font Info: ... okay on input line 6.
LaTeX Font Info: Checking defaults for OMS/cmsy/m/n on input line 6.
LaTeX Font Info: ... okay on input line 6.
LaTeX Font Info: Checking defaults for OT1/cmr/m/n on input line 6.
LaTeX Font Info: ... okay on input line 6.
LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 6.
LaTeX Font Info: ... okay on input line 6.
LaTeX Font Info: Checking defaults for TS1/cmr/m/n on input line 6.
LaTeX Font Info: ... okay on input line 6.
LaTeX Font Info: Checking defaults for OMX/cmex/m/n on input line 6.
LaTeX Font Info: ... okay on input line 6.
LaTeX Font Info: Checking defaults for U/cmr/m/n on input line 6.
LaTeX Font Info: ... okay on input line 6.
Class revtex4 Info: Unrecognized LaTeX tabular. Please update this document cla
ss! (Proceeding with fingers crossed.) on input line 6.
Class revtex4 Info: cite was not loaded (OK!) on input line 6.
Class revtex4 Info: multicol was not loaded (OK!) on input line 6.
LaTeX Font Info: External font `cmex10' loaded for size
(Font) <12> on input line 32.
LaTeX Font Info: External font `cmex10' loaded for size
(Font) <8> on input line 32.
LaTeX Font Info: External font `cmex10' loaded for size
(Font) <6> on input line 32.
LaTeX Font Info: External font `cmex10' loaded for size
(Font) <5> on input line 32.
LaTeX Font Info: External font `cmex10' loaded for size
(Font) <7> on input line 32.
[1] [2] (Width.aux) )
Here is how much of TeX's memory you used:
2414 strings out of 478839
33164 string characters out of 2857897
343673 words of memory out of 3000000
20396 multiletter control sequences out of 15000+600000
407894 words of font info for 42 fonts, out of 8000000 for 9000
1141 hyphenation exceptions out of 8191
72i,7n,80p,220b,319s stack positions out of 5000i,500n,10000p,200000b,80000s
Output written on Width.dvi (2 pages, 2092 bytes).