Lookup of serializer for role 'html' failed : what cud be the problem??

[Sampangi, Dinesh]

Hi!,   I get this Exception while trying to access the application.   Message: Lookup of serializer for role 'html' failed. Description: org.apache.cocoon.ProcessingException: Lookup of serializer for role 'html' failed.: org.apache.avalon.framework.component.ComponentException: serializers: ComponentSelector could not access the Component for hint [html] (key [html]) Sender: org.apache.cocoon.servlet.CocoonServlet Source: Cocoon Servlet Request URI sampleapp cause org.apache.avalon.framework.configuration.ConfigurationException: No value is associated with the configuration element "cdata-section-elements" at resource://framework/conf/sitemap.xmap:89:11     Regards,  Dinesh B Sampangi