原因

his is BibTeX, Version 0.99d (TeX Live 2024)
The top-level auxiliary file: sn-article.aux
I couldn’t open style file sn-mathphys-num.bst
—line 2 of file sn-article.aux
: \bibstyle{sn-mathphys-num
: }
I’m skipping whatever remains of this command
I found no style file—while reading file sn-article.aux
(There were 2 error messages)

解决

问题是由于缺少 sn-mathphys-num.bst 样式文件，确保 sn-mathphys-num.bst 文件存在于 TeX 目录或工作目录中
将bst的sn-mathphys-num.bst 复制上一级文件即可