Hi, I also received the same error. After I unzip the jboss-4.0.5.GA.zip and jbossws-1.0.4.GA.zip, I followed the install.txt in jbossws-1.0.4 and did the following: 1.) Copy lib/jboss-jdk1.5/jbossws-client.jar to $JBOSS_HOME/client/ 2.) Unzip lib/jboss-jdk1.5/jbossws.sar to $JBOSS_HOME/server/default/deploy/ 3.) Manually replacing jboss-xml-binding.jar in the $JBOSS_HOME/client and $JBOSS_HOME/lib directories with the jar file I got from http://repository.jboss.com/jboss/jbossxb/1.0.0.CR7 I have jdk 1.5 on my machine. I noticed that there is a jbossws14.sar under the deploy directory, does it have something to do with this problem? Any help is greatly appreciated since I want to use the new jboss soap stack. Thanks, Luan View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4006874#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...