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

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java.net.UnknownHostException:
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:195)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at org.apache.nutch.protocol.http.HttpResponse.(HttpResponse.java:97)
at org.apache.nutch.protocol.http.Http.getResponse(Http.java:64)
at org.apache.nutch.protocol.http.api.HttpBase.getProtocolOutput(HttpBase.java:225)

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