当我编译我的文档时，我收到错误
Package ifvtex Error: Name clash, \ifvtex is already defined.
但我仍然得到同样的错误。两个线程中的建议都归结为更新 MikTeX 安装，我已经使用 GUI 完成了。现在没有可能的更新了。
有人知道我能做什么吗？
请参阅下面的日志文件
This is pdfTeX, Version 3.14159265-2.6-1.40.20 (MiKTeX 2.9.7250 64-bit) (preloaded format=pdflatex 2019.12.17) 17 DEC 2019 14:48
entering extended mode
**./myQE.tex
(myQE.tex
LaTeX2e <2017-04-15>
Babel <3.18> and hyphenation patterns for 84 language(s) loaded.
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Document Class: Thesis 2007/22/02 v1.0 LaTeX document class
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Document Class: book 2014/09/29 v1.4h Standard LaTeX document class
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File: bk12.clo 2014/09/29 v1.4h Standard LaTeX file (size option)
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Package: fancyhdr 2019/01/31 v3.10 Extensive control of page headers and footer
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Package: amsmath 2017/09/02 v2.17a AMS math features
\@mathmargin=\skip52
For additional information on amsmath, use the `?' option.
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Package: amstext 2000/06/29 v2.01 AMS text
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File: amsgen.sty 1999/11/30 v2.0 generic functions
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Package: amsbsy 1999/11/29 v1.2d Bold Symbols
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Package: amsopn 2016/03/08 v2.02 operator names
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\inf@bad=\count88
LaTeX Info: Redefining \frac on input line 213.
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\leftroot@=\count90
LaTeX Info: Redefining \overline on input line 375.
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\DOTSCASE@=\count92
LaTeX Info: Redefining \ldots on input line 472.
LaTeX Info: Redefining \dots on input line 475.
LaTeX Info: Redefining \cdots on input line 596.
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LaTeX Font Info: Redeclaring font encoding OML on input line 712.
LaTeX Font Info: Redeclaring font encoding OMS on input line 713.
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\@envbody=\toks17
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\mathdisplay@stack=\toks18
LaTeX Info: Redefining \[ on input line 2817.
LaTeX Info: Redefining \] on input line 2818.
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Package: amsfonts 2013/01/14 v3.01 Basic AMSFonts support
\symAMSa=\mathgroup4
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LaTeX Font Info: Overwriting math alphabet `\mathfrak' in version `bold'
(Font) U/euf/m/n --> U/euf/b/n on input line 106.
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Package: amscd 2017/04/14 v2.1 AMS Commutative Diagrams
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Package caption3 Info: TeX engine: e-TeX on input line 64.
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Package: trig 2016/01/03 v1.10 sin cos tan (DPC)
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File: graphics.cfg 2016/06/04 v1.11 sample graphics configuration
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Package graphics Info: Driver file: pdftex.def on input line 99.
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Package: kvdefinekeys 2016/05/16 v1.4 Define keys (HO)
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Package: etexcmds 2016/05/16 v1.6 Avoid name clashes with e-TeX commands (HO)
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Package: ifluatex 2016/05/16 v1.4 Provides the ifluatex switch (HO)
Package ifluatex Info: LuaTeX not detected.
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Package: iftex 2019/11/07 v1.0c TeX engine tests
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Package pdftexcmds Info: \pdf@primitive is available.
Package pdftexcmds Info: \pdf@ifprimitive is available.
Package pdftexcmds Info: \pdfdraftmode found.
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Package epstopdf-base Info: Redefining graphics rule for `.eps' on input line 4
38.
Package grfext Info: Graphics extension search list:
(grfext) [.pdf,.png,.jpg,.mps,.jpeg,.jbig2,.jb2,.PDF,.PNG,.JPG,.JPE
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(grfext) \AppendGraphicsExtensions on input line 456.
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Package: booktabs 2005/04/14 v1.61803 publication quality tables
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File: lstmisc.sty 2015/06/04 1.6 (Carsten Heinz)
\c@lstnumber=\count119
\lst@skipnumbers=\count120
\lst@framebox=\box30
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Package: listings 2015/06/04 1.6 (Carsten Heinz)
(Styles/lstpatch.sty
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Package: hyperref 2018/02/06 v6.86b Hypertext links for LaTeX
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Package: hobsub-hyperref 2019-11-14
hobsub not currently supported, see hobsub.dtx to extract original code
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Package: ifvtex 2016/05/16 v1.6 Detect VTeX and its facilities (HO)
! Package ifvtex Error: Name clash, \ifvtex is already defined.
See the ifvtex package documentation for explanation.
Type H <return> for immediate help.
...
l.170 }
%
Incompatible versions of \ifvtex can cause problems,
therefore package loading is aborted.
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Package: auxhook 2016/05/16 v1.4 Hooks for auxiliary files (HO)
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Package: intcalc 2016/05/16 v1.2 Expandable calculations with integers (HO)
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\Hy@SavedSpaceFactor=\count123
! Extra \fi.
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I'm ignoring this; it doesn't match any \if.
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File: hyperref.cfg 2002/06/06 v1.2 hyperref configuration of TeXLive
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Package hyperref Info: Option `bookmarks' set `true' on input line 4383.
Package hyperref Info: Option `bookmarksopen' set `true' on input line 4383.
Package hyperref Info: Option `bookmarksnumbered' set `true' on input line 4383
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Package hyperref Info: Option `hypertexnames' set `true' on input line 4383.
Package hyperref Info: Option `colorlinks' set `true' on input line 4383.
Package hyperref Info: Option `unicode' set `true' on input line 4383.
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File: puenc.def 2018/02/06 v6.86b Hyperref: PDF Unicode definition (HO)
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Package hyperref Info: Option `breaklinks' set `true' on input line 4383.
Package hyperref Info: Option `plainpages' set `false' on input line 4383.
Package hyperref Info: Hyper figures OFF on input line 4509.
Package hyperref Info: Link nesting OFF on input line 4514.
Package hyperref Info: Hyper index ON on input line 4517.
Package hyperref Info: Plain pages OFF on input line 4524.
Package hyperref Info: Backreferencing OFF on input line 4529.
Package hyperref Info: Implicit mode ON; LaTeX internals redefined.
Package hyperref Info: Bookmarks ON on input line 4762.
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LaTeX Info: Redefining \url on input line 5115.
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Package: bitset 2016/05/16 v1.2 Handle bit-vector datatype (HO)
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Package: bigintcalc 2016/05/16 v1.4 Expandable calculations on big integers (HO
)
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Package hyperref Info: Hyper figures OFF on input line 6369.
Package hyperref Info: Link nesting OFF on input line 6374.
Package hyperref Info: Hyper index ON on input line 6377.
Package hyperref Info: backreferencing OFF on input line 6384.
Package hyperref Info: Link coloring ON on input line 6387.
Package hyperref Info: Link coloring with OCG OFF on input line 6394.
Package hyperref Info: PDF/A mode OFF on input line 6399.
LaTeX Info: Redefining \ref on input line 6439.
LaTeX Info: Redefining \pageref on input line 6443.
("C:/Program Files (x86)/MiKTeX 2.9\tex/generic/oberdiek\atbegshi.sty"
Package: atbegshi 2016/06/09 v1.18 At begin shipout hook (HO)
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\Hy@abspage=\count126
\c@Item=\count127
\c@Hfootnote=\count128
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! Extra \fi.
\Hy@AtEndOfPackageHook ...ver \@empty \fi \fi \fi
\let \HyOpt@DriverType \lt...
l.168 \newcommand
*{\supervisor}[1]{\def\supname{#1}}
I'm ignoring this; it doesn't match any \if.
! Extra \fi.
\Hy@AtEndOfPackageHook ...\fi \fi \fi \fi \fi \fi
\ifx \Hy@driver \Hy@defaul...
l.168 \newcommand
*{\supervisor}[1]{\def\supname{#1}}
I'm ignoring this; it doesn't match any \if.
! Extra \fi.
\Hy@AtEndOfPackageHook ...indo}{color}\fi \fi \fi
\else \def \HyOpt@DriverTy...
l.168 \newcommand
*{\supervisor}[1]{\def\supname{#1}}
I'm ignoring this; it doesn't match any \if.
! Extra \else.
\Hy@AtEndOfPackageHook ...color}\fi \fi \fi \else
\def \HyOpt@DriverType { (...
l.168 \newcommand
*{\supervisor}[1]{\def\supname{#1}}
I'm ignoring this; it doesn't match any \if.
! Extra \fi.
\Hy@AtEndOfPackageHook ...\HyOpt@CustomDriver \fi
\Hy@InfoNoLine {Driver\HyO...
l.168 \newcommand
*{\supervisor}[1]{\def\supname{#1}}
I'm ignoring this; it doesn't match any \if.
Package hyperref Info: Driver (custom): .
! LaTeX Error: File `.def' not found.
Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: def)
Enter file name:
! Emergency stop.
<read *>
l.168 \newcommand
*{\supervisor}[1]{\def\supname{#1}}
*** (cannot \read from terminal in nonstop modes)
Here is how much of TeX's memory you used:
11010 strings out of 493235
158197 string characters out of 3132710
227981 words of memory out of 3000000
14477 multiletter control sequences out of 15000+200000
3938 words of font info for 15 fonts, out of 3000000 for 9000
1141 hyphenation exceptions out of 8191
49i,0n,45p,322b,219s stack positions out of 5000i,500n,10000p,200000b,50000s
! ==> Fatal error occurred, no output PDF file produced!
答案1
我不能确定问题是否如 Ulrike Fischer 所指出的那样，即有 2 个 MikTeX 安装（一个在 Program Files 中，另一个在 Program Files (x86) 中），但一旦我删除其中一个并执行 MikTeX 的全新安装，它就可以再次正常工作。