title: What is the cause of this Umbrella Exception
body: <p>The application is loading in the browser, however it is throwing exceptions which says </p>
  
  <blockquote>
    <p>11:59:49.770 [ERROR] [loginform] Uncaught exception escaped
    com.google.gwt.event.shared.UmbrellaException: One or more exceptions
    caught, see full set in UmbrellaException#getCauses
        at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:129)
        at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:129)
        at com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:116)
        at com.google.gwt.user.client.ui.Widget.onBrowserEvent(Widget.java:177)
        at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1351)</p>
  </blockquote>
  
  <p>What is the cause and how to resolve this?</p>