app.post is not a function
TypeError: app.post is not a function
    at module.exports (C:Usersanmocar1DesktopnodeNodeJSPortableDatavroutesindex.js:41:9)
    at Layer.handle [as handle_request] (C:Usersanmocar1DesktopnodeNodeJSPortableDatanode_modulesexpresslibrouterlayer.js:95:5)
    at trim_prefix (C:Usersanmocar1DesktopnodeNodeJSPortableDatanode_modulesexpresslibrouterindex.js:312:13)
    at C:Usersanmocar1DesktopnodeNodeJSPortableDatanode_modulesexpresslibrouterindex.js:280:7
    at Function.process_params (C:Usersanmocar1DesktopnodeNodeJSPortableDatanode_modulesexpresslibrouterindex.js:330:12)
    at next (C:Usersanmocar1DesktopnodeNodeJSPortableDatanode_modulesexpresslibrouterindex.js:271:10)
    at SendStream.error (C:Usersanmocar1DesktopnodeNodeJSPortableDatanode_modulesexpressnode_modulesserve-staticindex.js:120:7)
    at emitOne (events.js:77:13)
    at SendStream.emit (events.js:169:7)
    at SendStream.error (C:Usersanmocar1DesktopnodeNodeJSPortableDatanode_modulesexpressnode_modulessendindex.js:245:17)

var UserModel = require('../models/user');
module.exports = function(app)
{
    app.get("/createTable", function(req, res)
    {
        UserModel.createUsersTable();
        res.end();
    });
    app.get("/", function(req, res)
    {
        res.render('index', {
            titulo: 'Formularios en NodeJS con Bootstrap'
        });
    });
    app.get("/users", function(req, res){
        UserModel.getUsers(function(error, data)
        {
            res.render('users', {
                titulo: 'Usuarios registrados en el blog',
                usuarios : data
            });
        });
    });
    app.post("/register", function(req,res){
        UserModel.registerUser({username:req.body.username,password:req.body.password}, function(data)
        {
            if(data)
            {
                if(data.msg === "existe")
                {
                    res.send("existe", 200);
                }
                else
                {
                    res.send("creado", 200);
                }
            }
            else
            {
                res.send("error", 400);
            }
        });
        res.end();
    });
}

module.exports = app;

app.get(//your code);
app.post(//your code);
//etc..