Android : Twitter login not showing screen in Parse.com Android?

I create Parse.com application and create Twitter Application as well. I updated Consumer and Consumer Secret key in Parse application.

I wrote following code:

onCreate() of Application:

Parse.initialize(this, APPLICATION_KEY_PARSE, CLIENT_KEY_PARSE);
ParseTwitterUtils.initialize("Consumer_key", "consumer_secret_key");

This my code on Twitter Button login:

twitterLogin.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                ParseTwitterUtils.logIn(MainActivity.this, new LogInCallback() {
                    @Override
                    public void done(ParseUser user, ParseException err) {
                        if (user == null) {
                            Log.d("MyApp",
                                    "Uh oh. The user cancelled the Twitter login.");
                        } else if (user.isNew()) {
                            Log.d("MyApp",
                                    "User signed up and logged in through Twitter!");
                        } else {
                            Log.d("MyApp", "User logged in through Twitter!");
                        }
                    }
                });

            }
        });

But when i click button it shows loading but doesnt Twitter login. Please help.