Cannot apply CSS through GWT WindowBuilder editor for a multiple modules/Entrypoint application

I usually use GWT WindowBuilder editor to design my GWT application UI,
however I refactored my application to implement multiple
modules/EntryPoint as described in my other post:
http://stackoverflow.com/questions/8834946/dealing-with-rpc-when-doing-multiple-gwt-modules

Now I am getting this error "There are no CSS files referenced from
modules HTML." when I click the CSS button from the Property Editor of
the WindowBuilder editor.

Is there any way to fix this error.

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