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java.lang.NullPointerException: 	at oracle.adf.mds.internal.Cache.checkSameGrouping(Cache.java:518)	at oracle.adf.mds.internal.Cache.isMoveAttrsValid(Cache.java:589)	at oracle.adf.mds.internal.SessionCache.moveElement(SessionCache.java:2139)	at oracle.adf.mds.internal.SessionCache.doElementModifications(SessionCache.java:934)	at oracle.adf.mds.internal.parse.CustomParser.startElement(CustomParser.java:217)	at oracle.cabo.share.xml.TreeBuilder$Handler.startElement(Unknown Source)	at oracle.cabo.share.xml.ParserAdapter.startElement(Unknown Source)	at oracle.xml.parser.v2.XMLContentHandler.startElement(XMLContentHandler.java:181)	at oracle.xml.parser.v2.NonValidatingParser.parseElement(NonValidatingParser.java:1288)	at oracle.xml.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:336)	at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:303)	at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:206)	at oracle.cabo.share.xml.ParserAdapter.parse(Unknown Source)	at oracle.cabo.share.xml.TreeBuilder.parse(Unknown Source)	at oracle.cabo.share.xml.TreeBuilder.parse(Unknown Source)	at oracle.adf.mds.internal.parse.ParserUtils.createNode(ParserUtils.java:283)	at oracle.adf.mds.internal.parse.ParserUtils.createNode(ParserUtils.java:115)	at oracle.adf.mds.adapters.DBAdapter.loadSharedCustomizationData(DBAdapter.java:637)	at oracle.adf.mds.custom.CustomizationManagerImpl.loadAdminCustomizations(CustomizationManagerImpl.java:1453)	at oracle.adf.mds.custom.CustomizationManagerImpl.createCache(CustomizationManagerImpl.java:1049)	at oracle.adf.mds.custom.CustomizationManagerImpl.findDocs(CustomizationManagerImpl.java:349)	at oracle.apps.fnd.framework.personalization.PersonalizationHelper._findDocs(Unknown Source)	at oracle.apps.fnd.framework.personalization.PersonalizationHelper.getSelectedDocuments(Unknown Source)	at oracle.apps.fnd.framework.personalization.PersonalizationHelper.getDocumentOverview(Unknown Source)	at oracle.apps.fnd.framework.personalization.webui.DocOverviewRNCO.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.beans.layout.OAStackLayoutBean.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.beans.layout.OAStackLayoutBean.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAPageLayoutHelper.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.beans.layout.OAPageLayoutBean.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.beans.form.OAFormBean.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.beans.OABodyBean.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAPageBean.processRequest(Unknown Source)	at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(Unknown Source)	at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(Unknown Source)	at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(Unknown Source)