I'm completely sured that there is the bug in JBossTools. 'Cause plug-in "org.eclipse.wst.common.project.facet.core (1.1.0)" is from previous releases of WTP. I guess WTP 1.5.2 or 1.5.3. And this errors appears not only in update, but also when i try to disable JBoss AS. It shows the same error. And why it says here that I need WTP 2.0? Could U try to fix it? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4058390#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...