Node.js Heroku在使用命令“npm start'”启动进程后继续崩溃；

我是新手。我正在按照来自的教程制作facebook messenger机器人示例

就在我第一次在heroku部署它的时候，我遇到了一个错误

这是我的package.json

{
  "name": "spbot",
  "version": "1.0.0",
  "description": "Testbot",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node app.js"
  },
  "author": "Munkh",
  "license": "ISC",
  "dependencies": {
    "body-parser": "^1.17.1",
    "express": "^4.15.2",
    "mongoose": "^4.9.1",
    "request": "^2.81.0"
  }
}

这里是app.js

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

var app = express();
app.use(bodyParser.urlencoded({extended: false}));
app.use(bodyParser.json());
app.listen((process.env.PORT || 5000));

// Server index page
app.get("/", function (req, res) {
  res.send("Deployed!");
});

// Facebook Webhook
// Used for verification
app.get("/webhook", function (req, res) {
  if (req.query["hub.verify_token"] === "this_is_my_token") {
    console.log("Verified webhook");
    res.status(200).send(req.query["hub.challenge"]);
  } else {
    console.error("Verification failed. The tokens do not match.");
    res.sendStatus(403);
  }
});

我犯了这样的错误

2017-03-20T02:11:15.997279+00:00 heroku[web.1]: State changed from crashed to starting
2017-03-20T02:11:17.849748+00:00 heroku[web.1]: Starting process with command `npm start`
2017-03-20T02:11:20.455381+00:00 app[web.1]: 
2017-03-20T02:11:20.455396+00:00 app[web.1]: > spbot@1.0.0 start /app
2017-03-20T02:11:20.455397+00:00 app[web.1]: > node app.js
2017-03-20T02:11:20.455397+00:00 app[web.1]: 
2017-03-20T02:11:20.978077+00:00 heroku[web.1]: Process exited with status 0
2017-03-20T02:11:20.994169+00:00 heroku[web.1]: State changed from starting to crashed
2017-03-20T02:11:20.994986+00:00 heroku[web.1]: State changed from crashed to starting
2017-03-20T02:11:23.337790+00:00 heroku[web.1]: Starting process with command `npm start`
2017-03-20T02:11:27.660508+00:00 app[web.1]: 
2017-03-20T02:11:27.660527+00:00 app[web.1]: > node app.js
2017-03-20T02:11:27.660526+00:00 app[web.1]: > spbot@1.0.0 start /app
2017-03-20T02:11:27.660528+00:00 app[web.1]: 
2017-03-20T02:11:27.896343+00:00 heroku[web.1]: State changed from starting to crashed
2017-03-20T02:11:27.881546+00:00 heroku[web.1]: Process exited with status 0

---

因为error并没有指定出错的地方，只是不断崩溃，所以我找不到解决方案。如果这是一个简单的问题，我深表歉意。

您必须指定您在package.json中使用的node.js和npm版本，如下所述

指定开发中使用的版本

{
  "name": "spbot",
  "version": "1.0.0",
  "description": "Testbot",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node app.js"
  },
  "author": "Munkh",
  "license": "ISC",
  "dependencies": {
    "body-parser": "^1.17.1",
    "express": "^4.15.2",
    "mongoose": "^4.9.1",
    "request": "^2.81.0"
  },
  "engines": {
    "node": "7.0.0",
    "npm": "3.10.8"
  }
}

---

很抱歉，我仍然无法使它与“引擎”：{“节点”：“7.0.0”，“npm”：“4.0.2”}一起工作？错误与before@Munkh-Erdeneerbileg 7.0.0的正确npm版本是3.10.8。检查更新的代码。