Error 401 when running 'npm install' on local

[gahuja91]

Hi All,
As suggested, I downloaded the Pizza Luvrs applications and trying to run npm install command to download dependeny requirements. I get the following error on executing npm install:
**_npm WARN optional SKIPPING OPTIONAL DEPENDENCY: commander@2.20.0 (node_modules\commander):
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Unable to authenticate, need: Bearer authorization_uri=https://login.windows.net/c1156c2f-a3bb-4fc4-ac07-3eab96da8d10, Basic realm="https://pkgsprodeus21.pkgs.visualstudio.com/", TFS-Federated

npm ERR! code E401
npm ERR! Unable to authenticate, need: Bearer authorization_uri=https://login.windows.net/c1156c2f-a3bb-4fc4-ac07-3eab96da8d10, Basic realm="https://pkgsprodeus21.pkgs.visualstudio.com/", TFS-Federated_**