BindView Annotations not working

    private CurrentWeather mCurrentWeather;

    @BindView(R.id.timeLabel) TextView mTimeLabel;
    @BindView(R.id.temperatureLabel) TextView mTemperatureLabel;
    @BindView(R.id.humidityValue) TextView mHumidityValue;
    @BindView(R.id.precipValue) TextView mPrecipValue;
    @BindView(R.id.summaryLabel) TextView mSummaryLabel;
    @BindView(R.id.iconImageView) ImageView mIconImageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

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

        ButterKnife.bind(this);

        //set up string to query API
        String apiKey = "c967557031449620255ff3c64b443a26";
        double latitude = 37.8267;
        double longitude = -122.4233;

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

        if (isNetworkAvailable()) {

            //make a new OkHttpClient object
            OkHttpClient client = new OkHttpClient();

            //new request object - method chaining
            Request request = new Request.Builder()
                    .url(forecastURL)
                    .build();

            //make a request from a Call class
            Call call = client.newCall(request);

            //make and asynchronous call with the enqueue method
            call.enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {

                }

                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    try {
                        if (response.isSuccessful()) {
                            String jsonData = response.body().string();

                            Log.v(TAG, jsonData);
                            mCurrentWeather = getCurrentDetails(jsonData);
                        } else {
                            alertUserAboutError();

                        }
                    } catch (IOException e) {
                        Log.e(TAG, "Exception caught", e);
                    } catch (JSONException e) {
                        Log.e(TAG, "JSON Exception Caught", e);
                    }
                }


            });
        } else {
            Toast.makeText(this, getString(R.string.network_unavailable_message),
                    Toast.LENGTH_LONG).show();
            //code challenge:  make into Dialog fragment
        }
        //log to console
        Log.d(TAG, "Main UI code is running!");

    }