我正在学习 reactjs - nodejs 我试图运行服务器，所以我安装了yarn、nodemon、express 但是当我尝试运行它时说错误命令失败，退出代码为 1。
我的错误是
PS D:\react project\ReactManagement-tutorial> yarn dev
yarn run v1.13.0
warning package.json: No license field
$ concurrently --kill-others-on-fail "yarn server" "yarn client"
warning package.json: No license field
warning package.json: No license field
$ nodemon server.js
$ cd client && yarn start
warning ..\package.json: No license field
$ react-scripts start
[1] 'react-scripts'??(??) ???? ??? ??? ????, ???
??? ?? ??? ??????, ???
[1] ??? ?????? ?????.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error …