请问这个报错是这么处理

[AKEXZ]

regx-node@0.0.1 start /www/wwwroot/World
node server.js

internal/modules/cjs/loader.js:626
throw err;
^

Error: Cannot find module 'express'
Require stack:

• /www/wwwroot/World/server.js
  at Function.Module._resolveFilename (internal/modules/cjs/loader.js:623:15)
  at Function.Module._load (internal/modules/cjs/loader.js:527:27)
  at Module.require (internal/modules/cjs/loader.js:681:19)
  at require (internal/modules/cjs/helpers.js:16:16)
  at Object. (/www/wwwroot/World/server.js:8:18)
  at Module._compile (internal/modules/cjs/loader.js:774:30)
  at Object.Module._extensions..js (internal/modules/cjs/loader.js:785:10)
  at Module.load (internal/modules/cjs/loader.js:641:32)
  at Function.Module._load (internal/modules/cjs/loader.js:556:12)
  at Function.Module.runMain (internal/modules/cjs/loader.js:837:10) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/www/wwwroot/World/server.js' ]
  }
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! regx-node@0.0.1 start: node server.js
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the regx-node@0.0.1 start script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  npm WARN Local package.json exists, but node_modules missing, did you mean to install?

npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2019-09-01T15_33_53_830Z-debug.log

[AKEXZ]

我刚刚安装了modules模块但还是提示未安装

[AKEXZ]

不好意思，是因为没在根目录执行npm run start，已经成功谢谢