运行我的 node.js 程序时 Heroku 上的 H12 错误

当我尝试在 Heroku 上运行我的应用程序时出现 H12 错误。这是错误。

at=error code=H12 desc="Request timeout" method=GET path="/" host=zevsbot.herokuapp.com request_id=fa37cd30-9f13-4bd2-bc6a-de4b9c0709a2 fwd="202.21.107.88" dyno=web.1 connect=0ms service=30001ms status=503 bytes=0 protocol=https

我的档案

web: node index.js

这是我的 index.js 文件

var express = require('express');
var app = express();

app.set('port', (process.env.PORT || 5000));

app.use(express.static(__dirname + '/public'));

app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');

app.get('/', function(request, response) {
    response.render;
});

app.listen(app.get('port'), function() {
    console.log('Node app is running on port', app.get('port'))
});

这是我的 package.json 文件，如果有帮助的话

{
  "requires": true,
  "lockfileVersion": 1,
  "dependencies": {
    "bundle": "^2.1.0",
    "ejs": "^2.6.1",
    "express": "^4.9.8",
    "steam-tradeoffer-manager": "^2.9.5",
    "steam-user": "^4.8.0",
    "steamcommunity": "^3.40.0",
    "tf2": "^3.0.0"
  },
  "name": "bot",
  "version": "1.0.0",
  "main": "index.js",
  "devDependencies": {},
  "scripts": {
    "start": "node index.js"
  },
  "author": "Zev",
  "license": "ISC",
  "description": "Wow",
  "engines": {
    "node": "10.15.3"
  }
}

如果你们能提供帮助，我将不胜感激。