Sun exception

The first time I am seeing an exception in Sun's website

http://docs.sun.com/app/docs/doc/820-2563/relnotes-6-products?a=view

Exception

An exception occured, and has been logged.

Name:

java.lang.IllegalArgumentException

Error code:

Message:

Doctype nickname is null

Stack trace:

 at eng.pubs.docbase.ResultDoctype.getInstance(ResultDoctype.java:33)
 at eng.pubs.docbase.DocBaseConnection.getDocNode(DocBaseConnection.java:684)
 at eng.pubs.servlet.DocServlet.doDoc(DocServlet.java:542)
 at eng.pubs.servlet.DocServlet.doDocBaseRequest(DocServlet.java:246)
 at eng.pubs.servlet.DocBaseServlet.doRequest(DocBaseServlet.java:122)
 at eng.pubs.servlet.TextServlet.doGet(TextServlet.java:158)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:796)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:917)
 at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:398)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277)
 at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:255)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:556)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:187)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:556)
 at com.sun.webserver.connector.nsapi.NSAPIProcessor.service(NSAPIProcessor.java:160)