java.net.UnknownHostException: ..

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java.net.UnknownHostException: ..
at java.net.InetAddress.getAllByName0(InetAddress.java:577)
at java.net.InetAddress.getAllByName0(InetAddress.java:546)
at java.net.InetAddress.getByName(InetAddress.java:455)
at java.net.Socket.(Socket.java:98)
at sun.net.NetworkClient.doConnect(NetworkClient.java:54)
at sun.net.NetworkClient.openServer(NetworkClient.java:42)
at sun.net.ftp.FtpClient.openServer(FtpClient.java:271)
at sun.net.ftp.FtpClient.(FtpClient.java:385)

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