Cannot POST form nodejs

Here is my form.html

<form action="/submit" method="post" enctype="multipart/form-data">
Email<br>
<input type="email" tabindex="-1" class="email-field" name="email" placeholder="Your email address..."><br><input class="btn btn-primary btn-xl js-scroll-trigger"type="submit" value="Submit">
</form>

and here is app.js

 var http = require('http');
var express = require('express');
var fs = require('fs');
app = express.createServer();
app.configure(function(){
  app.set('port', process.env.PORT || 3000);
  app.use(express.logger('dev'));
  app.use(express.bodyParser());
});
app.post('/submit', function(req, res) {
  fs.appendFile('emailDatabase.txt', req.body.email, function (err) {
        if (err) throw err;
      console.log('Saved!');
    });
});

And I'm getting error Cannot POST /submit I've only 1 form I want to process and app.js is all my "backend".Those 2 files are in the same dir It all seems to be fine or should I define routes ?? Basically it is just landing page to create email database