Apps Notifications Issue

[sweebo]

Hello, i'm followed the following tutorial:

Android Cloud to Device Messaging (C2DM) - Tutorial

However when i run my android application REGISTRATION doesn't through google doesn't seem to be happening, i'm refering to the following code:

public void register(View view)
{
Context context = getApplicationContext();

Log.v("C2DM", "start registration process");
Intent intent = new Intent("com.google.android.c2dm.intent.REGISTER");
intent.putExtra("app", PendingIntent.getBroadcast(this, 0, new Intent(), 0));

// Sender currently not used
intent.putExtra("sender", "uni@gmail.com");
startService(intent);
Log.v("C2DM", "start intent");
}

public void showRegistrationId(View view)
{
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String string = prefs.getString(AUTH, "n/a");
Toast.makeText(this, string, Toast.LENGTH_LONG).show();
Log.d("C2DM RegId", string);

}

The log doesn't show any errors however my button to print out the RegId shows the default value of n/a and it seems no value is being recived from google.

Any help would be very much appreciate. Thanks