vue npm run dev 运行错误

Question

$ npm run dev

weixin@1.0.0 dev E:项目Vue开发微信
node build/dev-server.js

module.js:471

throw err;
^

Error: Cannot find module 'merge-descriptors'

at Function.Module._resolveFilename (module.js:469:15)
at Function.Module._load (module.js:417:25)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
at Object.<anonymous> (E:\项目\Vue开发微信\node_modules\_express@4.15.3@express\lib\express.js:16:13)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)

npm ERR! Windows_NT 6.1.7601
npm ERR! argv "D:\Program Files\nodejs\node.exe" "D:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js" "run" "dev"
npm ERR! node v6.10.2
npm ERR! npm v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! weixin@1.0.0 dev: node build/dev-server.js
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the weixin@1.0.0 dev script 'node build/dev-server.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the weixin package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node build/dev-server.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs weixin
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls weixin
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! E:项目Vue开发微信npm-debug.log

Answer 1

少了这个模块'merge-descriptors'吗
npm install 了没有

Answer 2

这个报错我也碰到过，尝试用cnpm install，npm install 都装一下，后来就不报错了。