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

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java.lang.NullPointerException:
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1189)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1289)
at oracle.jdbc.driver.OracleStatement.executeInternal(OracleStatement.java:1909)
at oracle.jdbc.driver.OracleStatement.execute(OracleStatement.java:1871)
at oracle.jdbc.driver.OracleStatementWrapper.execute(OracleStatementWrapper.java:318)
at oracle.dbtools.db.DBUtil.hasAccess(DBUtil.java:1817)
at oracle.dbtools.raptor.query.QueryUtils.checkNonOracleAccess(QueryUtils.java:506)
at oracle.dbtools.raptor.query.QueryUtils.getQuery(QueryUtils.java:337)
at oracle.dbtools.raptor.query.QueryUtils.getQuery(QueryUtils.java:242)
at oracle.dbtools.raptor.query.ObjectQueries.getQuery(ObjectQueries.java:42)
at oracle.dbtools.raptor.navigator.db.xml.XmlObjectFactory.createFolderInstance(XmlObjectFactory.java:49)
at oracle.dbtools.raptor.navigator.db.xml.XmlTypeOwnerInstance.listTypeFolders(XmlTypeOwnerInstance.java:93)
at oracle.dbtools.raptor.navigator.db.impl.TypeContainerTreeNode.loadTypeFolders(TypeContainerTreeNode.java:111)
at oracle.dbtools.raptor.navigator.db.impl.DatabaseTreeNode$LoadTask.doWork(DatabaseTreeNode.java:184)
at oracle.dbtools.raptor.navigator.db.impl.DatabaseTreeNode$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)

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