npm run prestart && npm run start fail

[yuzhidi]

~/study/webpack-hot-server-example
$ npm run prestart && npm run start

webpack-hot-server-example@1.0.0 prestart D:\study\webpack-hot-server-example
rimraf build

webpack-hot-server-example@1.0.0 prestart D:\study\webpack-hot-server-example
rimraf build

webpack-hot-server-example@1.0.0 start D:\study\webpack-hot-server-example
webpack --watch

Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.

• configuration.output.path: The provided value "./build/server" is not an absolute path!
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! webpack-hot-server-example@1.0.0 start: webpack --watch
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the webpack-hot-server-example@1.0.0 start script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Administrator\AppData\Roaming\npm-cache_logs\2020-09-28T02_38_08_003Z-debug.log