myeclipse编译出现以下异常是什么情况，？对于输出的操作一闪而过，紧接着出现下面的异常。。。

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)