Vaadin PortalDefaultWidgetSet not found in liferay when changing ROOT ctxt

I am using liferay as portlet container where default context is loaded from ROOT folder under webapps.

I have changed name of ROOT folder to dashboard and associated required changes to liferay properties files.

Now when i run my app other portlets are working properly but portlets developed using vaadin ( Same for vaadin-demo 6.6.2) are not displaying any content in them.

After url tracing i can see that

GET	404 text/html 

request for url /VAADIN/widgetsets/ is failing as getting 404 for url.

So i am not sure what is going wrong here.

Can any one please help me in this.

Using Liferay 6.0.5
Vaadin 6.6.2