Problem serving static files in Google app engine

Hi,
I am using the google app engine plugin, I am facing a problem with serving static files. My conf is like this:


<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
    <application>yourscrum</application>
    <version>1</version>
    <sessions-enabled>true</sessions-enabled>
    <static-files>
        <include path="/css/ui-lightness/jquery-ui-1.7.2.custom.css"/>
        <include path="/**/*.css" />
        <include path="/**/*.png" />
        <include path="/**/*.js" />
    </static-files>
</appengine-web-app>