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

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This exception has no message.
java.lang.NullPointerException:
at com.plumtree.uiinfrastructure.interpreter.MVCController.HandleRedirectChain(MVCController.java:917)
at com.plumtree.uiinfrastructure.interpreter.MVCController.HandleRedirect(MVCController.java:542)
at com.plumtree.uiinfrastructure.interpreter.Interpreter.HandleRequest(Interpreter.java:498)
at com.plumtree.uiinfrastructure.interpreter.Interpreter.DoService(Interpreter.java:190)
at com.plumtree.uiinfrastructure.web.XPPage.service(XPPage.java:300)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)
at java.lang.Thread.run(Thread.java:595)

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