使用 chemgreek.sty 运行 latex 文件时出错

Question

我正在尝试编译我的 Latex 文件，但收到以下错误

! Undefined control sequence.
<argument> Chem\str_uppercase:f
{\tl_head:n {alpha}}\str_lowercase:f {\tl_ta...
l.584 \chemgreek_drop_symbols:
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

由于我是 Latex 新手，我无法修复 chemgreek.sty 文件中的错误。因此，如果有人知道如何修复此问题，请告诉我。