Mislukt bij het messenger-get-started@1.0.0 start script 'knooppunt app.js

Mijn server werkt prima op de lokale, maar als ik begin server na dploying naar Amazon EC2 gooit de volgende foutmelding: Deze oplossing didnt voldoende voor mij https://github.com/fbsamples/messenger-platform-samples/issues/43

node dist/app.js

knooppunt 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.

Vermoeden niet het laden van process.env, ik heb zelfs geprobeerd om de harde code de volgende waarden, maar resultaat is hetzelfde.

const VALIDATION_TOKEN = '3f92bb17caf0e11f5632920a402e1687'

const PAGE_ACCESS_TOKEN = 'EAAN9j2KfDg0BAIUrb8ZCaPmgHQXyO88mR55X40gWSJ8gi0CagZC0bJ0wZCETTVFSIUHLC7Fr58O9q8JHrQYFtc1vT2ksjPxV2Z34dqZAUiZCfpyInRa24EyvZABvpK72nooh86TUCVlYn1F9njjIWlDVfvbNw481nZCvOOW0T5EOZAQZDZD'

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