问题一：# [webpack error in Cannot find module 'less']

npm install --save-dev less
npm install --save-dev less-loader
npm install --save-dev file-loader

问题二： error code ELIFECYCLE

21 error errno 1
22 error html-web@1.0.0 dev: node build/dev-server.js
22 error Exit status 1
23 error Failed at the html-web@1.0.0 dev script.
23 error This is probably not a problem with npm. There is likely additional logging output above.

npm问题
升级npm ,或者清除缓存