repack S Shipuunit

Hi All,
When I am trying to build a "Repack S Ship Unit" I am getting below Null Pointer exception
can any one explain what is this for


java.lang.NullPointerException

java.lang.NullPointerException
at glog.business.equipment.RepackSShipUnitLogic.repac kSSUForNonMultistopShipment(RepackSShipUnitLogic.j ava:141)
at glog.business.equipment.RepackSShipUnitLogic.proce ss(RepackSShipUnitLogic.java:60)
at glog.business.shipment.AbstractShipmentLogic.perfo rm(AbstractShipmentLogic.java:67)
at glog.business.service.shipment.ShipmentRepackServi ce.repackSShipUnit(ShipmentRepackService.java:38)
at glog.business.action.shipment.RepackSShipUnitActio n.process(RepackSShipUnitAction.java:58)
at glog.business.action.shipment.AbstractShipmentPlan ningAction.perform(AbstractShipmentPlanningAction. java:167)
at glog.business.session.ShipmentPlanningActionSessio nBean.repackSShipUnit(ShipmentPlanningActionSessio nBean.java:3720)
at glog.business.session.ShipmentPlanningActionSessio nServerSideEJBWrapper.repackSShipUnit(ShipmentPlan ningActionSessionServerSideEJBWrapper.java:3476)
at glog.business.session.ShipmentPlanningActionSessio nServerSideEJBWrapper_7zfvrj_EOImpl.__WL_invoke(Un known Source)
at weblogic.ejb.container.internal.SessionRemoteMetho dInvoker.invoke(SessionRemoteMethodInvoker.java:40 )
at glog.business.session.ShipmentPlanningActionSessio nServerSideEJBWrapper_7zfvrj_EOImpl.repackSShipUni t(Unknown Source)
at glog.business.session.gen.ShipmentPlanningActionSe ssionSkel.repackSShipUnit(ShipmentPlanningActionSe ssionSkel.java:2358)
at glog.business.session.gen.ShipmentPlanningActionSe ssionSkel.exec(ShipmentPlanningActionSessionSkel.j ava:445)
at glog.webserver.wrapper.SkelImpl.execDispatch(SkelI mpl.java:16)
at glog.server.wrapper.WrapperSessionBean.execDispatc h(WrapperSessionBean.java:62)
at glog.server.wrapper.WrapperSessionServerSideEJBWra pper.execDispatch(WrapperSessionServerSideEJBWrapp er.java:48)
at glog.server.wrapper.WrapperSessionHome_a06097_EOIm pl.__WL_invoke(Unknown Source)
at weblogic.ejb.container.internal.SessionRemoteMetho dInvoker.invoke(SessionRemoteMethodInvoker.java:40 )
at glog.server.wrapper.WrapperSessionHome_a06097_EOIm pl.execDispatch(Unknown Source)
at glog.server.wrapper.WrapperSessionHome_a06097_EOIm pl_WLSkel.invoke(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicS erverRef.java:667)
at weblogic.rmi.cluster.ClusterableServerRef.invoke(C lusterableServerRef.java:230)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicSe rverRef.java:522)
at weblogic.security.acl.internal.AuthenticatedSubjec t.doAs(AuthenticatedSubject.java:363)
at weblogic.security.service.SecurityManager.runAs(Se curityManager.java:146)
at weblogic.rmi.internal.BasicServerRef.handleRequest (BasicServerRef.java:518)
at weblogic.rmi.internal.wls.WLSExecuteRequest.run(WL SExecuteRequest.java:118)
at weblogic.work.ExecuteThread.execute(ExecuteThread. java:256)
at weblogic.work.ExecuteThread.run(ExecuteThread.java :221)