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java.lang.NullPointerException: 	at edu.cornell.mannlib.vitro.webapp.dao.jena.PropertyDaoJena.getSubPropertyURIs(PropertyDaoJena.java:147)	at edu.cornell.mannlib.vitro.webapp.controller.edit.DatapropEditController.doPost(DatapropEditController.java:150)	at edu.cornell.mannlib.vitro.webapp.controller.edit.DatapropEditController.doGet(DatapropEditController.java:179)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)	at edu.cornell.mannlib.vitro.webapp.controller.VitroHttpServlet.service(VitroHttpServlet.java:70)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at edu.cornell.mannlib.vitro.webapp.filters.PageRoutingFilter.doNonDisplayPage(PageRoutingFilter.java:110)	at edu.cornell.mannlib.vitro.webapp.filters.PageRoutingFilter.doFilter(PageRoutingFilter.java:101)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at edu.cornell.mannlib.vitro.webapp.filters.RequestModelsPrep.doFilter(RequestModelsPrep.java:115)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at edu.cornell.mannlib.vitro.webapp.filters.URLRewriterFilter.doFilter(URLRewriterFilter.java:38)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at edu.cornell.mannlib.vitro.webapp.filters.JSessionStripFilter.doFilter(JSessionStripFilter.java:60)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at edu.cornell.mannlib.vitro.webapp.filters.CachingResponseFilter.produceBasicResponse(CachingResponseFilter.java:322)	at edu.cornell.mannlib.vitro.webapp.filters.CachingResponseFilter.doFilter(CachingResponseFilter.java:115)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at edu.cornell.mannlib.vitro.webapp.i18n.selection.LocaleSelectionFilter.doFilter(LocaleSelectionFilter.java:63)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at edu.cornell.mannlib.vitro.webapp.filters.CharsetEncodingFilter.doFilter(CharsetEncodingFilter.java:25)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at edu.cornell.mannlib.vitro.webapp.filters.SessionTimeoutLimitingFilter.doFilter(SessionTimeoutLimitingFilter.java:39)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at edu.cornell.mannlib.vitro.webapp.filters.StartupStatusDisplayFilter.doFilter(StartupStatusDisplayFilter.java:64)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:724)