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java.lang.NullPointerException: 	at oracle.dbtools.raptor.navigator.db.xml.NavigatorHook.getConnectionType(NavigatorHook.java:231)	at oracle.dbtools.raptor.navigator.ObjectFactoryRegistry.createFactory(ObjectFactoryRegistry.java:164)	at oracle.dbtools.raptor.navigator.ObjectFactoryRegistry.getFactory(ObjectFactoryRegistry.java:153)	at oracle.dbtools.raptor.navigator.db.impl.DatabaseTreeNode.getObjectFactory(DatabaseTreeNode.java:84)	at oracle.dbtools.raptor.navigator.db.impl.DatabaseTreeNode$LoadTask.doWork(DatabaseTreeNode.java:138)	at oracle.dbtools.raptor.navigator.db.impl.DatabaseTreeNode$LoadTask.doWork(DatabaseTreeNode.java:112)	at oracle.dbtools.raptor.backgroundTask.RaptorTask.call(RaptorTask.java:193)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$RaptorFutureTask.run(RaptorTaskManager.java:554)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)