An unhandled exception occurred: Cannot find module '@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/utils' code example

Example 1: An unhandled exception occurred: Cannot find module '@angular-devkit/build-angular/package.json' Require stack:

npm install --save-dev @angular-devkit/build-angular

Example 2: Error: Cannot find module 'webpack-dev-server'

npm install --save-dev webpack-dev-middleware webpack-hot-middleware