Vue installation report error

  git, question

The vue large-scale application is built and installed step by step according to the novice tutorial, but in the cnpm run dev Times (Node: 1192) UnhandledPromiseRejection Warning: UnhandledPromiseRejection (Rejection ID: 1): Error: Spawncmdenoent error.
The following is the content of the README.md file

my-project

A Vue.js project

Build Setup

# install dependencies
 npm install
 
 # serve with hot reload at localhost:8080
 npm run dev
 
 # build for production with minification
 npm run build
 
 # build for production and view the bundle analyzer report
 npm run build --report
 
 # run unit tests
 npm run unit
 
 # run e2e tests
 npm run e2e
 
 # run all tests
 npm test

For a detailed explanation on how things work, check out theguideanddocs for vue-loader.

After Baidu is not, the default browser problem is not the problem of environmental variables. . But I just can’t find the answer. . . Pray for the great gods to solve this problem
Ps: Because of the initial contact and the failure of the operation, the global installation of $ CNPM Install-GlobalVue-CLI was performed many times during the repeated installation process (I wonder if this is the problem? ? )

Resolved, check whether the port number is occupied, restart the computer,