Ich habe versucht, eine Beispiel-Node.js-App auf Heroku zusammenzustellen, wie hier beschrieben:https://devcenter.heroku.com/articles/nodejs

Die App läuft lokal einwandfrei mitforeman startAllerdings stürzt die App jedes Mal ab, wenn ich sie bereitstelle.Was mache ich falsch?

MeineProcfile enthält:

<code>web: node web.js
</code>

Meinepackage.json enthält:

<code>{
  "name": "testapp",
  "version": "0.0.1",
  "engines": {
      "node": "0.6.15"
    , "npm": "1.1.9"    
  }
  , "dependencies": {
    "tower": "0.4.0-12"
  }
}
</code>

Meineweb.js enthält:

<code>var express = require('express');

var app = express.createServer(express.logger());

app.get('/', function(request, response) {
  response.send('Hello World!');
});

var port = process.env.PORT || 3000;
app.listen(port, function() {
  console.log("Listening on " + port);
});
</code>

Die App wird bereitgestellt und gestartet, stürzt jedoch jedes Mal ab. Die Protokollausgabe, die ich von der App sehe, ist:

<code>2012-04-27T20:21:31+00:00 heroku[web.1]: State changed from created to starting
2012-04-27T20:21:37+00:00 heroku[web.1]: Starting process with command `node web.js`
2012-04-27T20:21:38+00:00 app[web.1]: 
2012-04-27T20:21:38+00:00 app[web.1]: node.js:201
2012-04-27T20:21:38+00:00 app[web.1]:         throw e; // process.nextTick error, or 'error' event on first tick
2012-04-27T20:21:38+00:00 app[web.1]:               ^
2012-04-27T20:21:38+00:00 app[web.1]: Error: Cannot find module 'express'
2012-04-27T20:21:38+00:00 app[web.1]:     at Function._resolveFilename (module.js:332:11)
2012-04-27T20:21:38+00:00 app[web.1]:     at Function._load (module.js:279:25)
2012-04-27T20:21:38+00:00 app[web.1]:     at Module.require (module.js:354:17)
2012-04-27T20:21:38+00:00 app[web.1]:     at require (module.js:370:17)
2012-04-27T20:21:38+00:00 app[web.1]:     at Object.<anonymous> (/app/web.js:1:77)
2012-04-27T20:21:38+00:00 app[web.1]:     at Module._compile (module.js:441:26)
2012-04-27T20:21:38+00:00 app[web.1]:     at Object..js (module.js:459:10)
2012-04-27T20:21:38+00:00 app[web.1]:     at Module.load (module.js:348:31)
2012-04-27T20:21:38+00:00 app[web.1]:     at Function._load (module.js:308:12)
2012-04-27T20:21:38+00:00 app[web.1]:     at Array.0 (module.js:479:10)
2012-04-27T20:21:39+00:00 heroku[web.1]: Process exited with status 1
2012-04-27T20:21:40+00:00 heroku[web.1]: State changed from starting to crashed
2012-04-27T20:30:01+00:00 heroku[router]: Error H10 (App crashed) -> GET testapp.herokuapp.com/ dyno= queue= wait= service= status=503 bytes=
</code>