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java.lang.NullPointerException: 	at info.extensiblecatalog.OAIToolkit.oai.dataproviders.LuceneFacadeDataProvider.doc2SetToRecordDTO(LuceneFacadeDataProvider.java:385)	at info.extensiblecatalog.OAIToolkit.oai.dataproviders.LuceneFacadeDataProvider.getSetsOfRecord(LuceneFacadeDataProvider.java:200)	at info.extensiblecatalog.OAIToolkit.api.Facade.transformRecord(Facade.java:839)	at info.extensiblecatalog.OAIToolkit.api.Facade.handleRecordLists(Facade.java:714)	at info.extensiblecatalog.OAIToolkit.api.Facade.doCachedSearch(Facade.java:383)	at info.extensiblecatalog.OAIToolkit.api.Facade.doListRecords(Facade.java:353)	at info.extensiblecatalog.OAIToolkit.struts.action.OaiRequestAction.execute(OaiRequestAction.java:80)	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)	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.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)	at java.lang.Thread.run(Thread.java:619)