Error log reflecting there is no valid app.js file

[shibinmohankv]

npm ERR! Linux 4.4.0-151-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "start"
npm ERR! node v4.2.6
npm ERR! npm v3.5.2
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! [email protected] start: node ./node_modules/webpack/bin/webpack.js; node dist/app.js
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the [email protected] start script 'node ./node_modules/webpack/bin/webpack.js; node dist/app.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the node-occ-sample package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node ./node_modules/webpack/bin/webpack.js; node dist/app.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs node-occ-sample
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls node-occ-sample
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! /root/node-occ/node-occ-sample/npm-debug.log