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java-error when using ESS

hi,

i have installed ESS service package 1.0.

when i do a preview of a iview of ESS i got a java-error. i am new to the portal and to java, so i don't understand the error. Can YOU help me out ?

com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Failed to load page

at java.lang.Throwable.<init>(Throwable.java:179)

at java.lang.Exception.<init>(Exception.java:29)

at java.lang.RuntimeException.<init>(RuntimeException.java:32)

at com.sap.exception.BaseRuntimeException.<init>(BaseRuntimeException.java:128)

at com.sap.tc.webdynpro.services.exceptions.WDRuntimeException.<init>(WDRuntimeException.java:55)

at com.sap.tc.webdynpro.services.exceptions.WDRuntimeException.<init>(WDRuntimeException.java:34)

at com.sap.portal.pb.PageBuilder.init(PageBuilder.java:527)

at com.sap.portal.pb.PageBuilder.wdDoInit(PageBuilder.java:191)

at com.sap.portal.pb.wdp.InternalPageBuilder.wdDoInit(InternalPageBuilder.java:150)

at com.sap.tc.webdynpro.progmodel.generation.DelegatingComponent.doInit(DelegatingComponent.java:108)

at com.sap.tc.webdynpro.progmodel.controller.Controller.initController(Controller.java:215)

at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:200)

at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.init(ClientComponent.java:430)

at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.init(ClientApplication.java:362)

at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.initApplication(ApplicationSession.java:748)

at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:283)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:759)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:712)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:261)

at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:149)

at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)

at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doPost(DispatcherServlet.java:53)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:332)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:0)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:336)

at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:868)

at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:250)

at com.sap.engine.services.httpserver.server.Client.handle(Client.java:0)

at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:92)

at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:30)

at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:35)

at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)

at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:99)

at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)

Caused by: javax.naming.NamingException: Failed to lookup External Link for: portal_content/com.sap.pct/every_user/com.sap.pct.erp.ess.bp_folder/com.sap.pct.erp.ess.iviews/com.sap.pct.erp.ess.personal_information/com.sap.pct.erp.ess.at/com.sap.pct.erp.ess.addr/com.sap.pct.erp.ess.addr [Root exception is com.sapportals.portal.prt.runtime.PortalRuntimeException: Failed to lookup External Link for: portal_content/com.sap.pct/every_user/com.sap.pct.erp.ess.bp_folder/com.sap.pct.erp.ess.iviews/com.sap.pct.erp.ess.personal_information/com.sap.pct.erp.ess.at/com.sap.pct.erp.ess.addr/com.sap.pct.erp.ess.addr]

at java.lang.Throwable.<init>(Throwable.java:194)

at java.lang.Exception.<init>(Exception.java:41)

at javax.naming.NamingException.<init>(NamingException.java:99)

at com.sapportals.portal.pcd.gl.JndiProxy.getObjectInstance(JndiProxy.java:47)

at com.sapportals.portal.pcd.gl.PcdGlContext.getSemanticObject(PcdGlContext.java:700)

at com.sapportals.portal.pcd.gl.PcdGlContext.getSemanticObject(PcdGlContext.java:629)

at com.sapportals.portal.pcd.gl.PcdGlContext.lookup(PcdGlContext.java:65)

at com.sapportals.portal.pcd.gl.PcdURLContext.lookup(PcdURLContext.java:234)

at javax.naming.InitialContext.lookup(InitialContext.java:347)

at com.sap.portal.pb.data.PcdManager.doInit(PcdManager.java:72)

at com.sap.portal.pb.PageBuilder.init(PageBuilder.java:525)

... 30 more

Caused by: com.sapportals.portal.prt.runtime.PortalRuntimeException: Failed to lookup External Link for: portal_content/com.sap.pct/every_user/com.sap.pct.erp.ess.bp_folder/com.sap.pct.erp.ess.iviews/com.sap.pct.erp.ess.personal_information/com.sap.pct.erp.ess.at/com.sap.pct.erp.ess.addr/com.sap.pct.erp.ess.addr

at java.lang.Throwable.<init>(Throwable.java:194)

at java.lang.Exception.<init>(Exception.java:41)

at java.lang.RuntimeException.<init>(RuntimeException.java:43)

at com.sapportals.portal.prt.runtime.PortalRuntimeException.<init>(PortalRuntimeException.java:57)

at com.sap.portal.pcm.iview.admin.AdminBaseiView.createAttrSetLayersList(AdminBaseiView.java:324)

at com.sap.portal.pcm.iview.admin.AdminBaseiView.getAttrSetLayersList(AdminBaseiView.java:190)

at com.sap.portal.pcm.iview.admin.AdminBaseiView.getCustomImplementation(AdminBaseiView.java:133)

at com.sap.portal.pcm.admin.PcmAdminBase.getImplementation(PcmAdminBase.java:524)

at com.sapportals.portal.ivs.iviews.IviewServiceObjectFactory.getObjectInstance(IviewServiceObjectFactory.java:121)

at com.sapportals.portal.prt.jndisupport.DirectoryManager.getObjectInstance(DirectoryManager.java:35)

... 38 more

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