Error command failed: yard

Solution 1: enter CMD in Win + R to enter the command line interface

Input command

npm install -g yarn

After success, re create the vue-cli4 project to solve the problem.

Solution 2:

Enter the C/users/administrator/Windows environment

There is a file. Vuerc

Open this file to show

{
  "useTaobaoRegistry": true,
  "packageManager": "yarn"
}

Just manually change the configuration content yarn to NPM to change the package manager when creating the project

Solution 3:

Delete the. Vuerc file. When creating a Vue project for the first time, you will be prompted to select configuration, and then you can select NPM.