code: protected void hideError() {
  
          if (hasError()) {
              CmsFadeAnimation.fadeOut(m_label.getElement(), new Command() {
  
                  /**
                   * @see com.google.gwt.user.client.Command#execute()
                   */
                  public void execute() {
  
                      setErrorVisible(false);
                  }
              }, 300);
          }
      }
docs: Hides the error.<p>