java.lang.NoSuchMethodError: org.w3c.dom.DocumentType: method getPublicId()Ljava/lang/String; not found

[Pratik Machchar <pr...@elitecore.com>]

Dear friends
While execution examples of Cocoon.
I get following message

java.lang.NoSuchMethodError: org.w3c.dom.DocumentType: method
getPublicId()Ljava/lang/String; not found
 at
org.apache.xml.serialize.BaseMarkupSerializer.serializeNode(BaseMarkupSerial
izer.java:845)
 at
org.apache.xml.serialize.BaseMarkupSerializer.serialize(BaseMarkupSerializer
.java:421)
 at org.apache.cocoon.formatter.HTMLFormatter.format(HTMLFormatter.java:90)
 at org.apache.cocoon.Engine.handle(Engine.java:319)
 at org.apache.cocoon.Cocoon.service(Cocoon.java:167)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:368)
 at org.apache.tomcat.core.Handler.service(Handler.java:261)
 at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:356)
 at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:72
0)
 at org.apache.tomcat.core.ContextManager.service(ContextManager.java:666)
 at
org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection
(Ajp12ConnectionHandler.java:166)
 at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:403)
 at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
 at java.lang.Thread.run(Thread.java:475)

does this mean I am missing something in configuration?
Please help me
Thanks in Advance
Pratik