我正在使用 Latex beamer documentclass 编写幻灯片。我遇到了**Package pgf Errors**: **Undefined shading** "beamer@barshade", "beamer@aboveframetitle", "beamer@belowframetitle"。
我曾在不同的机器/应用程序中尝试过相同的 tex 源代码，但得到了不同的结果：
1）我的旧 Mac Book Pro（MBP）装有 TexStudio：没有错误，且生成的 PDF 是正确的；
2) 我的旧 Mac Book Pro (MBP) 装有 TexShop：也没有错误，并且生成的 PDF 是正确的；
3) 我的新 iMAC（2019 年 8 月刚买的）装有 TexStudio：出现了上面提到的 Package pgf 错误，可以生成和查看 PDF，但缺少一些格式/阴影；
4) 我的新 iMAC 带有 TexShop：收到相同的错误消息，但无法生成 PDF；
以下是这 4 个实验的 Latex 源代码：
\documentclass{beamer}
% Setup appearance:
\usetheme{Darmstadt}
\usefonttheme[onlylarge]{structurebold}
\setbeamerfont*{frametitle}{size=\normalsize,series=\bfseries}
\setbeamertemplate{navigation symbols}{}
% Standard packages
\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage{times}
\usepackage[T1]{fontenc}
\title[Block Partitioning and Perfect Phylogenies]
{
Slide Title
}
\author[ABC]
{
Author 1\inst{1}
}
\institute[XYZ]
{
\inst{1}%
The Author is working here
}
\date[WABI 2006]
{Conference XXX, 2019}
\begin{document}
\begin{frame}
\titlepage
\end{frame}
\section{Introduction}
\begin{frame}[fragile]
\frametitle{Page Title}
\begin{itemize}
\item AAAAA
\item BBBBB
\item CCCC
\end{itemize}
\end{frame}
\end{document}
这是我的 iMAC（坏机器）和 TexStudio 日志文件（我的 latex 源文件名是：Beamer_iMAC_reduce.tex）：
This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019) (preloaded format=pdflatex 2019.9.13) 14 SEP 2019 23:25
entering extended mode
restricted \write18 enabled.
%&-line parsing enabled.
**Beamer_iMAC_reduce.tex
(./Beamer_iMAC_reduce.tex
LaTeX2e <2018-12-01>
(/usr/local/texlive/2019/texmf-dist/tex/latex/beamer/beamer.cls
Document Class: beamer 2018/12/02 v3.55 A class for typesetting presentations
(/usr/local/texlive/2019/texmf-dist/tex/latex/beamer/beamerbasemodes.sty
(/usr/local/texlive/2019/texmf-dist/tex/latex/etoolbox/etoolbox.sty
Package: etoolbox 2018/08/19 v2.5f e-TeX tools for LaTeX (JAW)
\etb@tempcnta=\count80
)
\beamer@tempbox=\box27
\beamer@tempcount=\count81
\c@beamerpauses=\count82
(/usr/local/texlive/2019/texmf-dist/tex/latex/beamer/beamerbasedecode.sty
\beamer@slideinframe=\count83
\beamer@minimum=\count84
)
\beamer@commentbox=\box28
\beamer@modecount=\count85
)
(/usr/local/texlive/2019/texmf-dist/tex/generic/oberdiek/ifpdf.sty
Package: ifpdf 2018/09/07 v3.3 Provides the ifpdf switch
)
***..........................................skip many message here..........................................***
No file Beamer_iMAC_reduce.nav.
! Package pgf Error: Undefined shading "beamer@barshade".
See the pgf package documentation for explanation.
Type H <return> for immediate help.
...
l.38 \begin{document}
This error message was generated by an \errmessage
command, so I can't give any explicit help.
Pretend that you're Hercule Poirot: Examine all clues,
and deduce the truth by order and method.
LaTeX Font Info: Font shape `T1/phv/bx/n' in size <10.95> not available
(Font) Font shape `T1/phv/b/n' tried instead on input line 41.
LaTeX Font Info: Font shape `T1/phv/bx/n' in size <14.4> not available
(Font) Font shape `T1/phv/b/n' tried instead on input line 41.
LaTeX Font Info: Try loading font information for U+msa on input line 41.
(/usr/local/texlive/2019/texmf-dist/tex/latex/amsfonts/umsa.fd
File: umsa.fd 2013/01/14 v3.01 AMS symbols A
)
LaTeX Font Info: Try loading font information for U+msb on input line 41.
(/usr/local/texlive/2019/texmf-dist/tex/latex/amsfonts/umsb.fd
File: umsb.fd 2013/01/14 v3.01 AMS symbols B
)
LaTeX Font Info: Font shape `T1/phv/m/it' in size <10.95> not available
(Font) Font shape `T1/phv/m/sl' tried instead on input line 41.
LaTeX Font Info: Font shape `T1/phv/m/it' in size <8> not available
(Font) Font shape `T1/phv/m/sl' tried instead on input line 41.
LaTeX Font Info: Font shape `T1/phv/m/it' in size <6> not available
(Font) Font shape `T1/phv/m/sl' tried instead on input line 41.
LaTeX Font Info: Font shape `T1/phv/m/it' in size <5> not available
(Font) Font shape `T1/phv/m/sl' tried instead on input line 41.
! Package pgf Error: Undefined shading "beamer@barshade".
See the pgf package documentation for explanation.
Type H <return> for immediate help.
...
l.41 \end{frame}
(That was another \errmessage.)
[1
{/usr/local/texlive/2019/texmf-var/fonts/map/pdftex/updmap/pdftex.map}]
\openout4 = `Beamer_iMAC_reduce.vrb'.
(./Beamer_iMAC_reduce.vrb)
LaTeX Font Info: Font shape `T1/phv/bx/n' in size <6> not available
(Font) Font shape `T1/phv/b/n' tried instead on input line 52.
! Package pgf Error: Undefined shading "beamer@aboveframetitle".
See the pgf package documentation for explanation.
Type H <return> for immediate help.
...
l.52 \end{frame}
(That was another \errmessage.)
! Package pgf Error: Undefined shading "beamer@belowframetitle".
See the pgf package documentation for explanation.
Type H <return> for immediate help.
...
l.52 \end{frame}
(That was another \errmessage.)
! Package pgf Error: Undefined shading "beamer@barshade".
See the pgf package documentation for explanation.
Type H <return> for immediate help.
...
l.52 \end{frame}
(That was another \errmessage.)
[2
]
\tf@nav=\write6
\openout6 = `Beamer_iMAC_reduce.nav'.
\tf@toc=\write7
\openout7 = `Beamer_iMAC_reduce.toc'.
\tf@snm=\write8
\openout8 = `Beamer_iMAC_reduce.snm'.
Package atveryend Info: Empty hook `BeforeClearDocument' on input line 55.
Package atveryend Info: Empty hook `AfterLastShipout' on input line 55.
(./Beamer_iMAC_reduce.aux)
Package atveryend Info: Executing hook `AtVeryEndDocument' on input line 55.
Package atveryend Info: Executing hook `AtEndAfterFileList' on input line 55.
Package rerunfilecheck Warning: File `Beamer_iMAC_reduce.out' has changed.
(rerunfilecheck) Rerun to get outlines right
(rerunfilecheck) or use package `bookmark'.
Package rerunfilecheck Info: Checksums for `Beamer_iMAC_reduce.out':
(rerunfilecheck) Before: <no file>
(rerunfilecheck) After: 4CA0FF56E3EE124326A4720E136735D1;47.
)
Here is how much of TeX's memory you used:
17977 strings out of 492616
340426 string characters out of 6129481
428168 words of memory out of 5000000
21465 multiletter control sequences out of 15000+600000
36742 words of font info for 55 fonts, out of 8000000 for 9000
1141 hyphenation exceptions out of 8191
56i,16n,65p,785b,496s stack positions out of 5000i,500n,10000p,200000b,80000s
{/usr/local/texlive/2019/texmf-dist/fonts/enc/dvips/base/8r.enc}</usr/local/t
exlive/2019/texmf-dist/fonts/type1/urw/helvetic/uhvb8a.pfb></usr/local/texlive/
2019/texmf-dist/fonts/type1/urw/helvetic/uhvr8a.pfb>
Output written on Beamer_iMAC_reduce.pdf (2 pages, 16331 bytes).
PDF statistics:
56 PDF objects out of 1000 (max. 8388607)
34 compressed objects within 1 object stream
6 named destinations out of 1000 (max. 500000)
97 words of extra memory for PDF output out of 10000 (max. 10000000)