My error alert doesn't pop up, app just crashes.

private CurrentWeather mCurrentWeather;

@InjectView(R.id.timeLabel)TextView mTimeLabel;
@InjectView(R.id.temperatureLabel) TextView mTemperatureLabel;
@InjectView(R.id.humidityValue) TextView mHumidityValue;
@InjectView(R.id.precipValue) TextView mPrecipValue;
@InjectView(R.id.summaryLabel) TextView mSummaryLabel;
@InjectView(R.id.iconImageView)ImageView mIconImageView;
@InjectView(R.id.refreshImageView)ImageView mRefreshImageView;
@InjectView(R.id.progressBar)ProgressBar mProgressBar;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButterKnife.inject(this);

    mProgressBar.setVisibility(View.INVISIBLE);

    final double latitude =37.8267;
    final double logitude = -122.423;

    mRefreshImageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            getForcast(latitude,logitude);
        }
    });

    getForcast(latitude,logitude);
    Log.d(TAG,"Main thread is running!!!");

}

private void getForcast(double latitude, double logitude) {
    String apiKey ="ace17aa2966c706e3ceec37c46f0eefa";

    String forcastURL = "https://api.forecast.io/forecast/"+ apiKey + "/" + latitude + "," +logitude;
    if(isNetworkAvailable()) {
        ToggleRefresh();

        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder().url(forcastURL).build();

        Call call = client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Request request, IOException e) {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        ToggleRefresh();
                    }
                });
                AlertUserAboutError();
            }

            @Override
            public void onResponse(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() {
                                ToggleRefresh();
                            }
                        });
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                UpdateDisplay();
                            }
                        });


                    } else {
                        AlertUserAboutError();
                    }
                } catch (IOException e) {
                    Log.e(TAG, "exceptions caught", e);
                }
                catch (JSONException e) {
                    Log.e(TAG, "exceptions caught", e);
                }
            }
        });
    }else {
        Toast.makeText(this, getString(R.string.error_noNetwork), Toast.LENGTH_LONG).show();

    }
}

private void ToggleRefresh() {
    if(mProgressBar.getVisibility()==View.INVISIBLE) {
        mProgressBar.setVisibility(View.VISIBLE);
        mRefreshImageView.setVisibility(View.INVISIBLE);
    }else {
        mProgressBar.setVisibility(View.INVISIBLE);
        mRefreshImageView.setVisibility(View.VISIBLE);
    }
}

private void UpdateDisplay() {
    mTemperatureLabel.setText(mCurrentWeather.getTemprature()+"");
    mTimeLabel.setText("At "+ mCurrentWeather.getFormatedTime()+ " it will be");
    mHumidityValue.setText(mCurrentWeather.getnHumididty()+ "");
    mPrecipValue.setText(mCurrentWeather.getPrecipChance()+"%");
    mSummaryLabel.setText(mCurrentWeather.getSummery());
    Drawable drawable = getResources().getDrawable(mCurrentWeather.getIconId());
    mIconImageView.setImageDrawable(drawable);
}

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

    JSONObject currently = forcast.getJSONObject("currently");
    CurrentWeather currentWeather = new CurrentWeather();
    currentWeather.setnHumididty(currently.getDouble("humidity"));
    currentWeather.setTime(currently.getLong("time"));
    currentWeather.setIcon(currently.getString("icon"));
    currentWeather.setPrecipChance(currently.getDouble("precipProbability"));
    currentWeather.setSummery(currently.getString("summary"));
    currentWeather.setTemprature(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;
}

        }

    });
    AlertDialog dialog = builder.create();
    dialog.show();

}