Fetching weather data using java and the wunderground api

I'm trying to fetch some weather data using java. I am using the following java api for fetching the data from wunderground.com

https://code.google.com/p/wunderground-core/

The example code they give on their website works okay for (Dortmund in Germany). However when I change the key from dortmund to Boston in the U.S.A, I get null pointer errors. Any idea what I could be doing wrong? Please try it and leave comments/advice. Thanks!

Code:

import de.mbenning.weather.wunderground.api.domain.DataSet;
import de.mbenning.weather.wunderground.api.domain.WeatherStation;
import de.mbenning.weather.wunderground.api.domain.WeatherStations;
import de.mbenning.weather.wunderground.impl.services.HttpDataReaderService;


public class weather {

    public static void main(String[] args)
    {

    // create a instance of a wunderground data reader
    HttpDataReaderService dataReader = new HttpDataReaderService();

    // select a wunderground weather station (ID "INORDRHE72" = Dortmund-Mengede)
    WeatherStation weatherStation = WeatherStations.ALL.get("INORDRHE72");
    // KMABOSTO22 is the ID for Boston South end
    //WeatherStation weatherStation = WeatherStations.ALL.get("KMABOSTO32");

    // set selected weather station to data reader
    dataReader.setWeatherStation(weatherStation);

    // get current (last) weather data set from selected station
    DataSet current = dataReader.getCurrentData();

    // print selected weather station ID
    System.out.println(weatherStation.getStationId());

    // print city, state and country of weather station
    System.out.println(weatherStation.getCity() + " " + weatherStation.getState() + " " + weatherStation.getCountry());

    //`enter code here` print datetime of measure and temperature ...
    System.out.println(current.getDateTime() + " " + current.getTemperature());
    }

}