richfaces components are not getting displayed on jsf 2.0 tomcat 6.0

[puneetgoyal king]

i get this error message on my web browser and richfaces components are not getting displayed..
i am using jsf 2.0 mojarra implementation, tomcat 6.0 and richfaces 4.0


* Warning: This page calls for XML namespace http://richfaces.org/rich declared with prefix rich but no taglibrary exists for that namespace.

[Mital Pritmani]

I was getting same error for .xhtml pages. When I changed it to .jsf (in pattern and also in welcome file list), the warning got disappeared and all the richfaces components started working well.