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java.lang.NullPointerException: 	at org.dspace.core.AbstractHibernateDSODAO.addMetadataLeftJoin(AbstractHibernateDSODAO.java:48)	at org.dspace.eperson.dao.impl.EPersonDAOImpl.getSearchQuery(EPersonDAOImpl.java:129)	at org.dspace.eperson.dao.impl.EPersonDAOImpl.findAll(EPersonDAOImpl.java:84)	at org.dspace.eperson.EPersonServiceImpl.findAll(EPersonServiceImpl.java:163)	at org.dspace.app.webui.servlet.admin.AuthorizeAdminServlet.doDSPost(AuthorizeAdminServlet.java:219)	at org.dspace.app.webui.servlet.DSpaceServlet.processRequest(DSpaceServlet.java:122)	at org.dspace.app.webui.servlet.DSpaceServlet.doPost(DSpaceServlet.java:80)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:644)