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java.lang.NullPointerException: 	at oracle.jbo.dt.modeler.diagram.dropHandler.BC4JXMLDropHandler.processObjects(BC4JXMLDropHandler.java:82)	at oracle.bm.addinUtil.IDEAppContext$4.performAction(Unknown Source)	at oracle.bm.diagrammer.LockMonitor.performLockedAction(Unknown Source)	at oracle.bm.diagrammer.BaseDiagram.performDiagramLockedAction(Unknown Source)	at oracle.bm.addinUtil.IDEAppContext.dropNavigatorNodeLater(Unknown Source)	at oracle.bm.addinUtil.IDEAppContext$5.run(Unknown Source)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)