Extreme, Please check two things for me and let me know. 1) Compare your .settings/org.jboss.tools.jst.web.xml against your co-workers. Does your co-worker have this file? If he/she does, it might point to libraries or JBoss runtimes that are located in different directories than what you checked into SVN with the project. 2) Verify that your co-worker's copy of JBoss Tools has the right project-level properties. I.e., check the Seam settings and verify that his/her Seam run-time path is right. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4138049#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...