widgetsets in demo problem

Dear all,

I download the demo source and install it, it works, but when I change the package to muiz.vcms, and also modify the files in folder VAADIN\widgetsets, and also change "com.vaadin.demo.sampler.gwt.SamplerWidgetSet" to "muiz.vcms.gwt.WidgetSet" in web.xml file, but faill to access the index page.

Below message was copied from index page. Do you know why?

Widgetset does not contain implementation for com.vaadin.demo.sampler.ActiveLink. Check its @ClientWidget mapping, widgetsets GWT module description file and re-compile your widgetset. In case you have downloaded a vaadin add-on package, you might want to refer to add-on instructions. Unrendered UIDL:
-Unrendered UIDL
-com.vaadin.demo.sampler.ActiveLink(NO CLIENT IMPLEMENTATION FOUND) id=PID46 caption=Home src=#
-variables
activated=false
opened=false
Widgetset does not contain implementation for com.vaadin.demo.sampler.GoogleAnalytics. Check its @ClientWidget mapping, widgetsets GWT module description file and re-compile your widgetset. In case you have downloaded a vaadin add-on package, you might want to refer to add-on instructions. Unrendered UIDL:




Widgetset does not contain implementation for com.vaadin.demo.sampler.ActiveLink. Check its @ClientWidget mapping, widgetsets GWT module description file and re-compile your widgetset. In case you have downloaded a vaadin add-on package, you might want to refer to add-on instructions. Unrendered UIDL:
-Unrendered UIDL
-com.vaadin.demo.sampler.ActiveLink(NO CLIENT IMPLEMENTATION FOUND) id=PID57 caption=All Samples src=#

Thanks guys!