Build error with Texlive2020

[panovr]

PS D:\Project\CQUBeamer> xelatex cqu_beamer.tex
This is XeTeX, Version 3.14159265-2.6-0.999992 (TeX Live 2020/W32TeX) (preloaded format=xelatex)
restricted \write18 enabled.
entering extended mode
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LaTeX2e <2020-02-02> patch level 5
L3 programming layer <2020-03-06>
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Class beamer Warning: mathserif'' is obsolete. Use font theme serif'' with
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For additional information on amsmath, use the `?' option.
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! failed to patch.
\errmessage {failed to patch}

l.227 {}{\errmessage{failed to patch}}

?

[panovr]

删除文件cqubeamer.sty中的以下部分就可以成功编译：

\patchcmd{\beamer@subsection}%
   {\Hy@writebookmark{\the\c@subsection}{#2}}%
    {\Hy@writebookmark{\the\c@subsection}{\numberline{\therealsection.\thesubsection}#2}}%
    {}{\errmessage{failed to patch}}
\patchcmd{\beamer@subsubsection}%
    {\Hy@writebookmark{\the\c@subsubsection}{#2}}%
    {\Hy@writebookmark{\the\c@subsubsection}{\numberline{\therealsection.\thesubsection.\thesubsubsection}#2}}%
    {}{\errmessage{failed to patch}}