NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on

package com.example.ideap.stormy;

import android.app.DownloadManager;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.nfc.Tag;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import butterknife.BindView;
import butterknife.ButterKnife;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {

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

    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);

        String apiKey = "78c0cc91ee5bab1d0b13f699f08459ef";
        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(Call call, IOException e) {

            }

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

                        if (response.isSuccessful()) {
                            mCurrentWeather = getCurrentDetails(jsonData);
                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    updateDisplay();
                                }
                            });
                        }
                        else{
                            AlertUserAboutError();
                        }
                        }
                catch (IOException e) {
                    Log.e(TAG, "Exception caught: ", e);
                }
                catch (JSONException e) {
                    Log.e(TAG, "Exception caught: ", e);
                }
            }
        });
        }
        else {
            Toast.makeText(this, R.string.Network_Unavailable_message, Toast.LENGTH_LONG).show();
        }
        Log.d(TAG, "Main UI Code is running!" );
    }

    private void updateDisplay() {

        mTemperatureLabel.setText(mCurrentWeather.getTemperature() + "");
      // mTimeLabel.setText(" At " + mCurrentWeather.getFormatedTime() + " it will be ");
    }

    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 = 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"));
        currentweather.setTimeZone(timezone);

        Log.d(TAG, currentweather.getFormatedTime());

        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");

    }
}