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java.lang.NullPointerException: 	at com.plumtree.uiinfrastructure.statichelpers.GeneralHelpers.Replace(GeneralHelpers.java:85)	at com.plumtree.portalpages.browsing.sitemap.linkselector.SiteMapLinkContainer.GetSelectedCommPagesAsStringForTree(SiteMapLinkContainer.java:206)	at com.plumtree.portalpages.browsing.editors.sitemap.sitemapfolderplugin.SiteMapFolderPlugInModel.GetSelectedCommPagesAsString(SiteMapFolderPlugInModel.java:744)	at com.plumtree.portalpages.browsing.editors.sitemap.sitemapfolderplugin.SiteMapFolderPlugInView.DisplayJavascript(SiteMapFolderPlugInView.java:493)	at com.plumtree.portalpages.portlets.sitemap.prefs.SiteMapPortletPrefsDP.DisplayJavaScriptFromChild(SiteMapPortletPrefsDP.java:92)	at com.plumtree.uiinfrastructure.form.AFormDP.Display(AFormDP.java:499)	at com.plumtree.uiinfrastructure.interpreter.Interpreter.HandleDisplayPage(Interpreter.java:2140)	at com.plumtree.uiinfrastructure.interpreter.Interpreter.HandleRequest(Interpreter.java:659)	at com.plumtree.uiinfrastructure.interpreter.Interpreter.DoService(Interpreter.java:191)	at com.plumtree.uiinfrastructure.web.XPPage.service(XPPage.java:300)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:821)	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:176)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3495)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)	at weblogic.security.service.SecurityManager.runAs(Unknown Source)	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2180)	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2086)	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1406)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)