Blocage de l'application lors du déploiement d'Heroku (Code h10)

J'essaye de déployer mon application sur Heroku et je n'arrête pas de planter. J'utilise ma CLI pour ouvrir mon application et elle plante toujours et je déploie même les branches sur le tableau de bord Keroku et elle plante toujours. Je me demandais ce qui ne va pas avec mon app.js ou packjson

Voici l'erreur que j'obtiens:

2019-06-19T12: 32: 14.679424 + 00: 00 heroku [router]: at = code d'erreur = H10 desc = "App planté" method = GET path = "/" hôte = guarded-island-18465.herokuapp.com request_id = 66a60c63-3bad-47ad-8255-85f56798df95fwd = "97.99.40.66" dyno = connect = service = état = 503 octets = protocol = https2019-06-19T12: 32: 15.283697 + 00: 00 heroku [routeur]: at = code d'erreur = H10 desc = "App a planté" method = GET path = "/ favicon.ico" hôte = guarded-island-18465.herokuapp.com request_id = 888cb97b-7aaf-4e0b-97c5-d01432d188a6 fwd = "97.99.40.66" dyno = connect = service = status = 503 octets = protocole = https

{
  "name": "newburger2",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node app.js"   
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/jnperk1234/neweatdaburger.git"
  },
  "author": "",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/jnperk1234/neweatdaburger/issues"
  },
  "homepage": "https://github.com/jnperk1234/neweatdaburger#readme",
  "dependencies": {
    "body-parser": "^1.19.0",
    "express": "^4.17.1",
    "express-handlebars": "^3.1.0",
    "mongodb": "^3.2.6",
    "mysql": "^2.17.1"
  }
}

var express = require("express");
var bodyParser = require("body-parser");
var exphbs = require("express-handlebars");

var app = express();
var PORT = process.env.PORT || 3000;

app.use(express.static("public"));

app.use(bodyParser.urlencoded({
    extended: true
}));
app.use(bodyParser.json());

app.engine("handlebars", exphbs({
    defaultLayout: "main"
}));
app.set("view engine", "handlebars");

var routes = require("./controllers/burgers_controller.js");
app.use(routes);

app.listen(port, "0.0.0.0", function () {
  console.log("Listening on Port 3000");
});