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

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This exception has no message.
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This exception has no message.
java.lang.NullPointerException:
at sun.net.TransferProtocolClient.sendServer(TransferProtocolClient.java:99)
at sun.net.ftp.FtpClient.issueCommand(FtpClient.java:160)
at sun.net.ftp.FtpClient.openDataConnection(FtpClient.java:218)
at sun.net.ftp.FtpClient.get(FtpClient.java:315)
at archivetool.FTPClientDialog.getFile(FTPClientDialog.java:579)
at archivetool.FTPClientDialog.access$100(FTPClientDialog.java:22)
at archivetool.FTPClientDialog$3.run(FTPClientDialog.java:202)

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