[xwiki-users] Error when installing Watch over an existing xwiki

Hello, I can install and run the standalone version of xwiki Watch with no problems. However, installing Watch app over an existing xwiki causes problems. Steps to reproduce: 1. I download xwiki-watch-1.0.xar 2. I start xwiki 2.3, and import the watch xar. The import tells me it was successfully accomplished 3. In Administration > Preferences > Programming, I add WatchCode.Translations as an Internationalization Document Bundle, and click Save 4. I go to Spaces, click Watch, and "Go To xwiki Watch Reader". I get Error message: "watch.errorwithcode - com.google.gwt.user.client.rpc.InvocationException. The call failed on the server": I also notice that under my Spaces in xwiki, WatchCode, WatchQueries, WatchSheets and Packager all have big blue question marks. This did not  when I import other xwiki apps Has any one encountered this Error? Can you suggest how I can get around it? Thank you, Thomas