JBoss Cache Service Error

Server Log is showing the following error, anyone no what the implications of this are and where the service should be configured?

2008-05-08 15:46:42,375 ERROR [org.jboss.web.tomcat.tc5.session.JBossCacheService] jboss.cache:service=TomcatClusteringCache service to Tomcat clustering not found
2008-05-08 15:46:42,390 ERROR [org.jboss.web.tomcat.tc5.session.JBossCacheManager] JBossCacheService to Tomcat clustering not found
2008-05-08 15:46:42,390 ERROR [org.jboss.web.tomcat.tc5.TomcatDeployer] Failed to setup clustering, clustering disabled