there's anybody can help me , why this error come out and give some explanation on it here the error : 11:50:08,531 DEBUG [SARDeployer] Unregistering service UCL=jmx.loading:UCL=4aa0ce 11:50:08,531 DEBUG [UnifiedLoaderRepository3] UnifiedLoaderRepository removed(true) org.jboss.mx.loading.UnifiedClassLoader3@4aa0ce{ url=file:/D:/jboss-4.0.2/server/default/tmp/deploy/tmp5390jboss-service.xml ,addedOrder=2} 11:50:08,531 ERROR [MainDeployer] could not create deployment: file:/D:/jboss-4.0.2/server/default/conf/jboss-service.xml org.jboss.deployment.DeploymentException: No ClassLoaders found for: org.jboss.system.pm.AttributePersistenceService; - nested throwable: (java.lang.ClassNotFoundException: No ClassLoaders found for: org.jboss.system.pm.AttributePersistenceService) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3989936#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...