express-generator sample returning Not Found error

I followed this guide to set up a sample express application on a shared host.

The super-simple "Hello World"-Example works just fine:

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

app.get('/express-hw/hello.txt', function(req, res){
  res.send('Hello World');
});

var server = app.listen(61245, function() {
    console.log('Listening on port %d', server.address().port);
});

Then I went to set up a sample application using express gameapiwhich went through fine. (gameapi is the project name). Launching the application works too.

(Edit) On Request, that is the app.js that is being generated.

However, at any request, the console reports a 404 Error:

GET /gameapi/public/images/test.jpg 40438.042 ms - 1282

And the output in the browser window is as follows:

Not Found
404

Error: Not Found
    at app.use.res.render.message (/var/www/virtual/ngmir/html/nodejs/gameapi/app.js:30:15)
    at Layer.handle [as handle_request] (/var/www/virtual/ngmir/html/nodejs/gameapi/node_modules/express/lib/router/layer.js:76:5)
    at trim_prefix (/var/www/virtual/ngmir/html/nodejs/gameapi/node_modules/express/lib/router/index.js:270:13)
    at /var/www/virtual/ngmir/html/nodejs/gameapi/node_modules/express/lib/router/index.js:237:9
    at Function.proto.process_params (/var/www/virtual/ngmir/html/nodejs/gameapi/node_modules/express/lib/router/index.js:312:12)
    at /var/www/virtual/ngmir/html/nodejs/gameapi/node_modules/express/lib/router/index.js:228:12
    at Function.match_layer (/var/www/virtual/ngmir/html/nodejs/gameapi/node_modules/express/lib/router/index.js:295:3)
    at next (/var/www/virtual/ngmir/html/nodejs/gameapi/node_modules/express/lib/router/index.js:189:10)
    at /var/www/virtual/ngmir/html/nodejs/gameapi/node_modules/express/lib/router/index.js:191:16
    at Function.match_layer (/var/www/virtual/ngmir/html/nodejs/gameapi/node_modules/express/lib/router/index.js:295:3)

I assume this is a server setup issue since the code is supposed to work 'out-of-the-box'. But I'm pretty much lost from there on. Can anyone give me any tips on what to look into?

Thanks a lot in advance.