myeclipse編譯出現以下異常是什么情況，？對于輸出的操作一閃而過，緊接著出現下面的異常。。。

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java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
?at java.net.PlainSocketImpl.socketBind(Native Method)
?at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:359)
?at java.net.ServerSocket.bind(ServerSocket.java:319)
?at java.net.ServerSocket.<init>(ServerSocket.java:185)
?at java.net.ServerSocket.<init>(ServerSocket.java:97)
?at URL.Server.main(Server.java:21)