I have the same problem.
My web application deploy well on tomcat 6.0 but when I try to deploy on JBoss4.2.2, it fails with the same error.
bump cause i would like to use jboss...
Got it to work! I removed all of my JSF jars in my lib folder. I guess JBoss has its own JSF lib files and the ones included in my project, via netbeans conflicted.