Here is the exact error on line 1:56 which is follows
<%@ taglib uri="http://richfaces.org/a4j" prefix="a4j" %>
The absolute uri:http://richfaces.org/a4j" prefix="a4j cannot be resolved in either web.xml or the jar files deployed

I have 3 jar files under libraries
richfaces-api-3.1.2.GA.jar
richfaces-impl-3.1.2.GA.jar
richfaces-ui-3.1.2.GA.jar

I was going to follow step by step Richfaces' documentation
http://labs.jboss.com/file-access/default/members/jbossrichfaces/freezone/docs/devguide/en/html_single/index.html

Thank you and have a great Thank Giving. I am new in Rich Faces and I love the documentation. The best documentation ever! Richfaces ROCKS!

By the way, I am using Netbeans 6