I have a typical Project with Node.js - Express 3 - MongoDB

I'm trying to make a query to my model 'Tweet' in my /routes/index.js and when I run my app crashed

24 Aug 11:35:07 - [nodemon] starting `node app.js`



/Applications/XAMPP/xamppfiles/htdocs/ocesa/fanocesa/node_modules/mongoose/lib/index.js:286

  throw new mongoose.Error.MissingSchemaError(name);

        ^

MissingSchemaError: Schema hasn't been registered for model Teewt.

Use mongoose.model(name, schema)

at Mongoose.model (/Applications/XAMPP/xamppfiles/htdocs/ocesa/fanocesa/node_modules/mongoose/lib/index.js:286:13)

at Object.<anonymous> (/Applications/XAMPP/xamppfiles/htdocs/ocesa/fanocesa/routes/index.js:6:33)

at Module._compile (module.js:456:26)

at Object.Module._extensions..js (module.js:474:10)

at Module.load (module.js:356:32)

at Function.Module._load (module.js:312:12)

at Module.require (module.js:364:17)

at require (module.js:380:17)

at Object.<anonymous> (/Applications/XAMPP/xamppfiles/htdocs/ocesa/fanocesa/app.js:7:14)

at Module._compile (module.js:456:26)

24 Aug 11:35:07 - [nodemon] app crashed - waiting for file changes before starting...

This is part of my app.js

var mongoose = require('mongoose');



mongoose.connect('mongodb://localhost/fanOcesa');

var Schema = mongoose.Schema;

var ObjectID = Schema.ObjectID;



var Teewt = new Schema({

    cuerpo: String

});



var Teewt = mongoose.model('Teewt', Teewt);



var app = express();



app.set('port', process.env.PORT || 3000);

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

app.set('view engine', 'jade');

app.use(express.favicon());

app.use(express.logger('dev'));

app.use(express.bodyParser());

app.use(express.methodOverride());

app.use(app.router);

app.use(express.static(path.join(__dirname, 'public')));



// development only

if ('development' == app.get('env')) {

  app.use(express.errorHandler());

}



app.get('/', routes.index);

app.get('/users', user.list);

And this is part of my index.js

var Teewt = require('mongoose').model('Teewt');



Teewt.find({}, function(err, docs){

    console.log('docs');

    console.log(docs);

});



exports.index = function(req, res){

    res.render('index', { 

        docs: docs

    });

};

which would be the correct way to do this query?