java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:333)
at oracle.xml.parser.v2.XSLSAXPrintDriver.endElement(XSLSAXPrintDriver.java:524)
at oracle.xml.parser.v2.XMLElement.reportSAXEvents(XMLElement.java:2950)
at oracle.xml.parser.v2.XMLElement.reportChildSAXEvents(XMLElement.java:2960)
at oracle.xml.parser.v2.XMLElement.reportSAXEvents(XMLElement.java:2949)
at oracle.xml.parser.v2.XMLElement.reportChildSAXEvents(XMLElement.java:2960)
at oracle.xml.parser.v2.XMLElement.reportSAXEvents(XMLElement.java:2112)
at oracle.xml.jaxp.JXTransformer.transform(JXTransformer.java:327)
at nextapp.echo2.webrender.output.XmlDocument.render(XmlDocument.java:107)
at nextapp.echo2.webcontainer.WindowHtmlService.service(WindowHtmlService.java:101)
at nextapp.echo2.webcontainer.NewInstanceService.service(NewInstanceService.java:76)
at nextapp.echo2.webrender.WebRenderServlet.process(WebRenderServlet.java:273)
at nextapp.echo2.webrender.WebRenderServlet.doGet(WebRenderServlet.java:185)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:356)
at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:294)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1776)
at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:514)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1726)
at org.mortbay.http.HttpServer.service(HttpServer.java:879)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:790)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:952)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:807)
at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:196)
at nextapp.es2.server.PrivateSocketListener.handleConnection(PrivateSocketListener.java:21)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:289)

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