events.js:85 is throwing an unhandled 'error' event after displaying a profile's info on the page.

response.end()

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

// Handle HTTP route GET / and POST / i.e. Home
function home(request,response) {
  //if url == "/" && GET
    if(request.url === "/") {
    //show search
          response.writeHead(200, {'Content-Type': 'text/plain'});
            response.write("Header1\n");
            response.write("Search1\n");
            response.end();
}
  //if url == "/" && POST
    //redirect to /:username
}

// Handle HTTP route GET /:username i.e. /darrynsmith
function user(request, response) {
  //if url == "/...."
    var username = request.url.replace("/", "");
    if(username.length > 0) {
        response.writeHead(200, {'Content-Type': 'text/plain'});
        response.write("Header2\n");

        //get json from Treehouse
        var studentProfile = new Profile(username);
    //on "end"
        studentProfile.on("end", function(profileJSON){
        //show profile  

            //Store the values which we need 
            var values = {
                avatarUrl: profileJSON.gravatar_url,
                username: profileJSON.profile_name,
                badges: profileJSON.badges.length,
                javascriptPoints: profileJSON.points.JavaScript
            }
            //Simple response
            response.write(values.username + " has " + values.badges + " badges\n");
            response.end();
        });

    //on "error"
        studentProfile.on("error", function(error){
            //show error
            response.write(error.message + "\n");
            response.end();
        });

    }
}

module.exports.home = home;
module.exports.user = user;

var EventEmitter = require("events").EventEmitter;
var http = require("http");
var https = require("https");
var util = require("util");

//******************* skip *******************

    var request = https.get("https://teamtreehouse.com/" + username + ".json", function(response) {
        var body = "";

        if (response.statusCode !== 200) {
            request.abort();
            //Status Code Error
            profileEmitter.emit("error", new Error("There was an error getting the profile for " + username + ". (" + http.STATUS_CODES[response.statusCode] + ")"));
        }