TypeError: null is not an object (evaluating '_reactNativeImageCropPicker.default.openPicker') getting this error what to do? code example

Example: evaluating '_reactNativeImageCropPicker.default.openCamera

@Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
          new MainReactPackage(),
            new PickerPackage(), // <== add this
            ....