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java.lang.NullPointerException: 	at oracle.dbtools.migration.workbench.core.navigator.MigrationProjectNavigatorManager.refreshElement(MigrationProjectNavigatorManager.java:152)	at oracle.dbtools.migration.workbench.core.ui.FullMigrateTask$5.run(FullMigrateTask.java:1458)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:666)	at java.awt.EventQueue.access$400(EventQueue.java:81)	at java.awt.EventQueue$2.run(EventQueue.java:627)	at java.awt.EventQueue$2.run(EventQueue.java:625)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:636)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)	at java.awt.Dialog$1.run(Dialog.java:1044)	at java.awt.Dialog$3.run(Dialog.java:1096)	at java.security.AccessController.doPrivileged(Native Method)	at java.awt.Dialog.show(Dialog.java:1094)	at java.awt.Component.show(Component.java:1591)	at java.awt.Component.setVisible(Component.java:1543)	at java.awt.Window.setVisible(Window.java:843)	at java.awt.Dialog.setVisible(Dialog.java:984)	at oracle.dbtools.raptor.backgroundTask.TaskDialog.showDelayedDialog(TaskDialog.java:88)	at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager.showModalDialog(RaptorTaskManager.java:290)	at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager.access$600(RaptorTaskManager.java:41)	at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$2.run(RaptorTaskManager.java:272)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:666)	at java.awt.EventQueue.access$400(EventQueue.java:81)	at java.awt.EventQueue$2.run(EventQueue.java:627)	at java.awt.EventQueue$2.run(EventQueue.java:625)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:636)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)