Error: Cannot find module '/root/.npm-global/lib/node_modules/@angular/cli/node_modules/node-sass/scripts/install.js'
    at Function.Module._resolveFilename (module.js:542:15)
    at Function.Module._load (module.js:472:25)
    at Function.Module.runMain (module.js:682:10)
    at startup (bootstrap_node.js:191:16)
    at bootstrap_node.js:613:3

> uglifyjs-webpack-plugin@0.4.6 postinstall /root/.npm-global/lib/node_modules/@angular/cli/node_modules/webpack/node_modules/uglifyjs-webpack-plugin
> node lib/post_install.js

module.js:544
    throw err;
    ^

Error: Cannot find module '/root/.npm-global/lib/node_modules/@angular/cli/node_modules/webpack/node_modules/uglifyjs-webpack-plugin/lib/post_install.js'
    at Function.Module._resolveFilename (module.js:542:15)
    at Function.Module._load (module.js:472:25)
    at Function.Module.runMain (module.js:682:10)
    at startup (bootstrap_node.js:191:16)
    at bootstrap_node.js:613:3