这是我遇到问题的代码：
\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{colortbl}
\begin{document}
\begin{equation}
f(x) = \begin{cases}
1, &\mbox{if $x=1$} \\
2, &\mbox{if $x=2$}
\end{cases}
\end{equation}
\end{document}
当我同时使用 amsmath 和 colortbl 包时，方程式（带有 \begin{cases}...\end{cases}）出现问题。当我编译文件时，它会报告“@startpbox 的使用与其定义不匹配。f(x) = \begin{cases}”和“额外 }，或忘记了 \endgroup。f(x) = \begin{cases}”。但是，如果我注释掉 \usepackage{colortbl}，文件就可以正常工作。有人知道如何解决这个不兼容问题吗？非常感谢！
顺便说一下，下面是完整的日志文件，附件如下：
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entering extended mode
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! Use of \@startpbox doesn't match its definition.
<inserted text> \@startpbox {
@{}l@{\quad }l@{}}
l.10 f(x) = \begin{cases}
If you say, e.g., `\def\a1{...}', then you must always
put `1' after `\a', since control sequence names are
made up of letters only. The macro here has not been
followed by the required stuff, so I'm ignoring it.
! Extra }, or forgotten \endgroup.
\@mkpream ...after \@startpbox \expandafter {#1}}}
\let \@endpbox \relax \let...
l.10 f(x) = \begin{cases}
I've deleted a group-closing symbol because it seems to be
spurious, as in `$x}$'. But perhaps the } is legitimate and
you forgot something else, as in `\hbox{$x}'. In such cases
the way to recover is to insert both the forgotten and the
deleted material, e.g., by typing `I$}'.
[1
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("C:\Users\jsun1\Dropbox\Junze media bias\Part Experiment\Working paper\Technic
al LaTeX problem\Incompatibility.aux") )
Here is how much of TeX's memory you used:
1466 strings out of 493921
18853 string characters out of 3144925
68398 words of memory out of 3000000
4794 multiletter control sequences out of 15000+200000
7050 words of font info for 26 fonts, out of 3000000 for 9000
841 hyphenation exceptions out of 8191
34i,9n,20p,232b,122s stack positions out of 5000i,500n,10000p,200000b,50000s
<C:/Users/jsun1/AppData/Local/Programs/
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Output written on Incompatibility.pdf (1 page, 26303 bytes).
PDF statistics:
18 PDF objects out of 1000 (max. 8388607)
0 named destinations out of 1000 (max. 500000)
1 words of extra memory for PDF output out of 10000 (max. 10000000)