Échec au script de démarrage messenger-get-started@1.0.0 « app.js de noeud

Mon serveur fonctionne très bien au niveau local, mais quand je commence serveur après dploying à EC2 amazone , il jette l'erreur suivante: Cette solution na pas suffit pour moi https://github.com/fbsamples/messenger-platform-samples/issues/43

node dist/app.js

noeud dist / app.js

events.js:141
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRINUSE :::3979
    at Object.exports._errnoException (util.js:907:11)
    at exports._exceptionWithHostPort (util.js:930:20)
    at Server._listen2 (net.js:1250:14)
    at listen (net.js:1286:10)
    at Server.listen (net.js:1382:5)
    at EventEmitter.listen (/var/www/node_modules/express/lib/application.js:618:24)
    at Object.<anonymous> (/var/www/dist/app.js:120:6)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)

npm ERR! Linux 3.13.0-44-generic
npm ERR! argv /usr/bin/nodejs /usr/bin/npm start
npm ERR! node v4.8.0
npm ERR! npm  v2.15.11
npm ERR! code ELIFECYCLE
npm ERR! mychatapp@1.0.0 start: `node dist/app.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the mychatapp@1.0.0 start script 'node dist/app.js'.
npm ERR! This is most likely a problem with the mychatapp package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node dist/app.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs mychatapp
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!
npm ERR!     npm owner ls mychatapp
npm ERR! There is likely additional logging output above.

Soupçonnant ne se charge pas de process.env, je l'ai même essayé de coder en dur les valeurs suivantes, mais le résultat est le même.

const VALIDATION_TOKEN = '3f92bb17caf0e11f5632920a402e1687'

const PAGE_ACCESS_TOKEN = 'EAAN9j2KfDg0BAIUrb8ZCaPmgHQXyO88mR55X40gWSJ8gi0CagZC0bJ0wZCETTVFSIUHLC7Fr58O9q8JHrQYFtc1vT2ksjPxV2Z34dqZAUiZCfpyInRa24EyvZABvpK72nooh86TUCVlYn1F9njjIWlDVfvbNw481nZCvOOW0T5EOZAQZDZD'

const SERVER_URL = 'http://http://ec2-54-220-173-191.us-west-