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);");
    }
void displayError ( String messageHTML ) { m_error . setValue ( messageHTML ) ; m_error . setVisible ( true ) ; CmsVaadinUtils . waggleMeOnce ( m_fakeWindow ) ; }
Displays the given login error.<p>

@param messageHTML the error message