ReferenceError: Profile is not defined

var profile = require("./profile.js")


function home(req , res){
    //if url == "/" && GET
     if(req.url === "/"){

    res.setHeader('Content-Type', 'text/plain');
    res.write("Hola Amigos")
    res.write("Footer\n");
    res.write("Pagina!!\n");
    res.end('Hello World\n');
   }
}
       //if url =="/" && POST
       //Redirect to /:userna}
   // handle HTTP route GET /: username i.e /rodrigo
    function user(req , res){
        var username = req.url.replace("/", "")
        if (username.length > 0 ){
        res.statusCode = 200;
        res.write("Hola Amigos")
        //ge json from Treehouse
        var studentProfile = new Profile(username);
        //on end
        studentProfile.on("end" , function(profileJSON){
            //Show profile
            var values = {
                avartarUrl : profileJSON.gravatar_url,
                username: profileJSON.profile_name,
                badges: profileJSON.badges.length,
                javascriptPoits : profileJSON.points.JavaScript ,
            }
            //simple response
            res.write(values.username + values.badges + " puntos \n");
            res.end("footter")
        }); 


        studentProfile.on("error" , function(error){
          res.end("footter")
            //show erros
        });
        }
    }
module.exports.home = home;
module.exports.user = user;
]