code: void displayError(String messageHTML) {
  
          // m_fakeWindow.addStyleName("waggler");
          m_error.setValue(messageHTML);
          m_error.setVisible(true);
          CmsVaadinUtils.waggleMeOnce(m_fakeWindow);
          //
          //Add JavaScript code, which adds the wiggle class and removes it after a short time.
          //        JavaScript.getCurrent().execute(
          //            "wiggleElement=document.querySelectorAll(\".waggler\")[0];\n"
          //                + "wiggleElement.className=wiggleElement.className + \" waggle\";\n"
          //                + "setTimeout(function () {\n"
          //                + "element=document.querySelectorAll(\".waggle\")[0];\n"
          //                + "element.className=element.className.replace(/\\bwaggle\\b/g, \"\");"
          //                + "    }, 1500);");
      }
docs: Displays the given login error.<p>
  
  @param messageHTML the error message