Error Receiving Broadcast Intent Problem

I created a broadcast receiver in the main activity and the background service which is sending broadcast intents. The application crashes each time I try to run it and the Log displays the following error message:

10-04 13:30:43.218: ERROR/AndroidRuntime(695): java.lang.RuntimeException: Error receiving broadcast Intent { action=com.client.gaitlink.CommunicationService.action.LOGIN_STATUS_UPDATE (has extras) } in com.client.gaitlink.GaitLink$LoginStatusReceiver@431690e8

The broadcast message is sent from CommunicationService class in the following method:

private void announceLoginStatus(){
    Intent intent = new Intent(LOGIN_STATUS_UPDATE);
    intent.putExtra(SERVER_MESSAGE, mServerResponseMessage);
    intent.putExtra(SESSION_STRING, mSessionString);
    sendBroadcast(intent);
}

where

String LOGIN_STATUS_UPDATE = "com.client.gaitlink.CommunicationService.action.LOGIN_STATUS_UPDATE"

in the main activity the following broadcast reveiver is defined:

public class LoginStatusReceiver extends BroadcastReceiver {

        public void onReceive(Context context, Intent intent) {
            String serverMessage = intent.getStringExtra(CommunicationService.SERVER_MESSAGE);
            String sessionString = intent.getStringExtra(CommunicationService.SESSION_STRING);

            userInfo.setSessionString(sessionString);
            saveSettings();
        }
    }

and registered in onResume method:

        IntentFilter loginStatusFilter;
        loginStatusFilter = new IntentFilter(CommunicationService.LOGIN_STATUS_UPDATE);
        loginStatusReceiver = new LoginStatusReceiver();
        registerReceiver(loginStatusReceiver, loginStatusFilter);

And the manifest file includes the following:

<activity android:name=".GaitLink"
              android:label="@string