java.net.UnknownHostException: This exception has no message.

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java.net.UnknownHostException:
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$1.lookupAllHostAddr(Unknown Source)
at java.net.InetAddress.getAddressFromNameService(Unknown Source)
at java.net.InetAddress.getAllByName0(Unknown Source)
at java.net.InetAddress.getAllByName0(Unknown Source)
at java.net.InetAddress.getAllByName(Unknown Source)
at java.net.InetAddress.getByName(Unknown Source)
at com.enterprisedt.net.ftp.FTPClient.setRemoteHost(FTPClient.java:1286)
at fulfillment_house.test_0_1.test.tFileInputDelimited_3Process(test.java:7516)
at fulfillment_house.test_0_1.test.runJobInTOS(test.java:18828)
at fulfillment_house.test_0_1.test.runJob(test.java:18752)
at fulfillment_house.testload_0_1.testload.tRunJob_1Process(testload.java:15231)
at fulfillment_house.testload_0_1.testload.tFileInputDelimited_1Process(testload.java:15178)
at fulfillment_house.testload_0_1.testload.runJobInTOS(testload.java:17637)
at fulfillment_house.testload_0_1.testload.main(testload.java:17551)

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