java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.dspace.storage.rdbms.DatabaseManager.queryTable(DatabaseManager.java:230)
at org.dspace.content.DSpaceObject$MetadataCache.retrieveMetadata(DSpaceObject.java:1330)
at org.dspace.content.DSpaceObject$MetadataCache.get(DSpaceObject.java:1265)
at org.dspace.content.DSpaceObject.getMetadata(DSpaceObject.java:676)
at org.dspace.content.DSpaceObject.getMetadata(DSpaceObject.java:585)
at org.dspace.content.DSpaceObject.getMetadataFirstValue(DSpaceObject.java:653)
at org.dspace.eperson.EPerson.getFirstName(EPerson.java:772)
at org.dspace.app.webui.util.UIUtil.sendAlert(UIUtil.java:419)
at org.dspace.app.webui.servlet.InternalErrorServlet.doGet(InternalErrorServlet.java:54)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:721)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:468)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:391)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318)
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:439)
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:382)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.coyote.ajp.AbstractAjpProcessor.process(AbstractAjpProcessor.java:844)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1526)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.lang.Thread.run(Thread.java:745)

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