code: private KeyFrame createSmallerScaleFrame(double errorContainerHeight) {
          return new KeyFrame(Duration.millis(100),
              new KeyValue(errorClipScale.yProperty(),
                  errorContainerHeight / getHeight(),
                  Interpolator.EASE_BOTH));
      }
docs: creates error animation frames when moving from large -> small error container
  
  @param errorContainerHeight
  @return