[xwiki-users] Problem installing xwatch.xar

Hi, I am installing xwiki-application-invitation-1.1.xar in my xwiki .it installs all the extracted file except it shows one error List of documents with errors WatchCode.GWT <http://localhost:8080/xwiki/bin/view/WatchCode/GWT> I also added gwt-client and gwt server jar files in my xwiki lib file and did modifications in web.xml as follows <servlet> <servlet-name>XWatchService</servlet-name> <servlet-class>com.xpn.xwiki.watch.server.XWatchServiceImpl</servlet-class> </servlet> <servlet-mapping> <servlet-name>XWatchService</servlet-name> <url-pattern>/XWatchService</url-pattern> </servlet-mapping> but nothing works.Please explain if it needs some more configuration to run it. Thanks, Simer