I think we fixed the error: anonymous wrote : java.lang.IllegalArgumentException: Stack must not be null by adding no-conversation-view-id="/welcome.xhtml" to pages.xml PS Funny this exception popped up today and I can't remember what was the cause. It's obvious from the stack trace that it has something to do with conversations. PS 2 If it's not that attribute in pages that is missing check, also that the seam filter is properly setup: http://fisheye.jboss.com/browse/JBoss/jboss-seam/seam2migration.txt?r=MAIN View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4067057#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...