I get this error in my Log: JSONException: No value for Summary. Does anyone know how to fix it?

public static final String TAG = MainActivity.class.getSimpleName();

private CurrentWeather mCurrentWeather;
@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    String apiKey = "64fd6c2dd5fb383c62e0e523f7b27fd9";
    double latitude = 37.8267;
    double longitude = -122.423;

    String forecastURL = "https://api.forecast.io/forecast/" + apiKey +
            "/" + latitude + "," + longitude;

    /// network issues
    if (isNetworkAvailable()) {


        OkHttpClient client = new OkHttpClient();


        /// clients request for the info
        Request request = new Request.Builder()
                .url(forecastURL)
                .build();

        // putting the request into the call
        Call call = client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Request request, IOException e) {

            }

            @Override
            public void onResponse(Response response) throws IOException {

                try {
                    String jsonData = response.body().string();
                    Log.v(TAG, jsonData);

                    // the response
                    if (response.isSuccessful()) {

                        mCurrentWeather = getCurrentDetails(jsonData);
                    } else {
                        alertUserAboutError();
                    }
                }
                catch (IOException e) {
                    Log.e(TAG, "Exception caught:", e);
                }
                catch (JSONException e) {
                    Log.e(TAG, "Exception caught:", e);
                }
            }
        });

    }

    else {
        Toast.makeText(this, getString(R.string.network_unavailable_message),
                Toast.LENGTH_LONG).show();
    }

    Log.d(TAG, "Main UI Code is running!");
}

// throwing an exception to where you want it

private CurrentWeather getCurrentDetails(String jsonData) throws JSONException{
    JSONObject forecast = new JSONObject(jsonData);
    String timezone = forecast.getString("timezone");
    Log.i(TAG, "From JSON:" + timezone);



    ///// setting a new json object for the currently key


    JSONObject currently = forecast.getJSONObject("currently");

    CurrentWeather currentWeather = new CurrentWeather();

    currentWeather.setHumidity(currently.getDouble("humidity"));
    currentWeather.setTime(currently.getLong("time"));
    currentWeather.setIcon(currently.getString("icon"));
    currentWeather.setPrecipChance(currently.getDouble("precipProbability"));
    currentWeather.setSummary(currently.getString("Summary"));
    currentWeather.setTemperature(currently.getDouble("temperature"));

    return currentWeather;
}


private boolean isNetworkAvailable() {

    ConnectivityManager manager = (ConnectivityManager)
            getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo networkInfo = manager.getActiveNetworkInfo();

    boolean isAvailable = false;

    if (networkInfo != null && networkInfo.isConnected())
    {

        isAvailable = true;

    }

    return isAvailable;


}

private void alertUserAboutError() {
    AlertDialogFragment dialog = new AlertDialogFragment();
    dialog.show(getFragmentManager(), "error_dialog");
}