【疑难】PHP7.4开启mbstring后报错，无法重启PHP

由于需要使用exif模块，所以开启mbstring，保存配置后无法重启PHP；
报错如下；

1. [18-Jul-2022 15:05:41] NOTICE: PHP message: PHP Warning: PHP Startup: Unable to load dynamic library 'mbstring' (tried: /www/server/php/74/lib/php/extensions/no-debug-non-zts-20190902/mbstring (/www/server/php/74/lib/php/extensions/no-debug-non-zts-20190902/mbstring: cannot open shared object file: No such file or directory), /www/server/php/74/lib/php/extensions/no-debug-non-zts-20190902/mbstring.so (/www/server/php/74/lib/php/extensions/no-debug-non-zts-20190902/mbstring.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
   
2. [18-Jul-2022 15:05:41] NOTICE: PHP message: PHP Warning: Module 'exif' already loaded in Unknown on line 0

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exif插件已经安装，还是报错；