Cannot resolve symbol getJSONObject

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 = "05cab61d21636f623158e406038a7540";
    double latitude = 37.8267;
    double longitude = -122.423;
    String forecastUrl= "https://api.forecast.io/forecast/" + apiKey +
            "/" + latitude + "," + longitude;

    if (isNetworkAvailable()) {
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder()
                .url(forecastUrl)
                .build();

        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);
                    if (response.isSuccessful()) {
                        mCurrentWeather = getCurrentDetails(jsonData);
                    } else {
                        alertUserAboutError();
                    }

                } catch (IOException e) {
                    e.printStackTrace();
                    Log.e(TAG, "Exception Caught: ", e);
                }

                  catch (JSONException e) {
                      Log.e(TAG, "Exception Caught: ", e);
                  }

            }
        });
    }

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

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

}

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

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

    CurrentWeather currentWeather = new CurrentWeather();

    return new 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");
}

defaultConfig {
    applicationId "com.townsee.stormy"
    minSdkVersion 14
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
}


packagingOptions {
    exclude 'LICENSE.txt'
}


buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}