Node.js with express app crashes on Heroku, works locally - node.js

Question

I have a Node.js with express running fine locally but crashes when I try to run it on Heroku.
When I deploy and go to the heroku subdomain:
The HTML loads but the CSS doesn't
When I refresh nothing loads and I get the generic application error
Looking at the logs it seems the app has crashed
Any ideas why heroku keeps crashing? Best guess is something to do with my static files.
Here are the logs:
2014-07-19T02:02:00.723361+00:00 heroku[router]: at=error code=H13 desc="Connection closed without response" method=GET path="/javascripts/main.js" host=sendmyemail.herokuapp.com request_id=3f2d4cd8-c70d-4506-9baf-af8d98983f37 fwd="99.43.254.71" dyno=web.1 connect=1 service=43 status=503 bytes=691
2014-07-19T02:02:00.708143+00:00 app[web.1]: throw er; // Unhandled 'error' event
2014-07-19T02:02:00.709158+00:00 app[web.1]: at errnoException (child_process.js:988:11)
2014-07-19T02:02:00.708150+00:00 app[web.1]: ^
2014-07-19T02:02:00.707641+00:00 app[web.1]:
2014-07-19T02:02:00.707753+00:00 app[web.1]: events.js:72
2014-07-19T02:02:00.709155+00:00 app[web.1]: Error: spawn ENOENT
2014-07-19T02:02:00.709160+00:00 app[web.1]: at Process.ChildProcess._handle.onexit (child_process.js:779:34)
2014-07-19T02:02:02.265464+00:00 heroku[web.1]: State changed from up to crashed
2014-07-19T02:02:03.554266+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=sendmyemail.herokuapp.com request_id=fc319b3f-924f-4e37-bf6f-a58a4dc25770 fwd="99.43.254.71" dyno=web.1 connect=100 service= status=503 bytes=
2014-07-19T02:02:02.255985+00:00 heroku[web.1]: Process exited with status 8
Here is my package.json:
{
"name": "myapp",
"version": "0.0.1",
"engines": {
"node": "0.10.26",
"npm": "1.4.20"
},
"scripts": {
"start": "node app.js"
},
"dependencies": {
"express": "~4.2.0",
"body-parser": "^1.4.3",
"node-compass": "0.2.3",
"ejs": "~1.0.0",
"express-ejs-layouts": "~1.1.0",
"mailgun-js": "^0.5.1"
}
}
I have my css and js in public folder and have this line in app.js:
app.use(express['static'](path.join(__dirname, 'public')));

Answer 1

I moved the line of code referring to static files (express.static) up above other lines of code and now it works fine on Heroku.
app.use(express.static(__dirname + '/public'));
app.engine('html', require('ejs').renderFile);
app.set('view engine', 'html');
app.set('layout', 'layout'); // defaults to 'layout'
app.use(require('node-compass')({mode: 'expanded'}));
app.use(expressLayouts);
app.use(bodyParser.urlencoded({ extended: false }));