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

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This exception has no message.
java.lang.NullPointerException:
at oracle.apps.xdo.delivery.ssh2.transport.TransportProtocolClient.negotiateVersion(TransportProtocolClient.java:170)
at oracle.apps.xdo.delivery.ssh2.transport.TransportProtocolClient.startTransportProtocol(TransportProtocolClient.java:481)
at oracle.apps.xdo.delivery.ssh2.SFTPDeliveryRequestHandler.submitRequest(SFTPDeliveryRequestHandler.java:90)
at oracle.apps.xdo.delivery.AbstractDeliveryRequest.submit(AbstractDeliveryRequest.java:1270)
at oracle.apps.fnd.cp.opp.FtpDeliveryProcessor.sftp(FtpDeliveryProcessor.java:150)
at oracle.apps.fnd.cp.opp.FtpDeliveryProcessor.deliver(FtpDeliveryProcessor.java:63)
at oracle.apps.fnd.cp.opp.DeliveryProcessor.process(DeliveryProcessor.java:91)
at oracle.apps.fnd.cp.opp.OPPRequestThread.run(OPPRequestThread.java:176)

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