Have problem to customize the richfaces skin, need help!

[luy1987]

I want to change the skin of my webapp, I follow the steps in the developer's guide, but it does not work.

Now I have a JSF project in Eclipse, it has the following folder structure

.metedata

.settings

build  ----.class document

src  ---.java document

Webcontent

  -META-INF

     -skins

        -mySkin.skin.properties

-resources

     -css

     -images

-WEB-INF

     -lib

     -faces-config.xml

     -web.xml

-index.xhtml

I have write the context-param in the

<context-param>

                    <param-name>org.richfaces.skin</param-name>

                    <param-value>mySkin</param-value>

          </context-param>

but when I run the project it shows the following wrong information

javax.servlet.ServletException: Skin with name mySkin not found

javax.faces.webapp.FacesServlet.service(FacesServlet.java:606)

util.CustomCharacterEncodingFilter.doFilter(CustomCharacterEncodingFilter.java:22)

so what's wrong with my project