Python如下报错是什么意思啊？

Traceback (most recent call last):
  File "D:\workspace\jsock\py\src\socket\tcpServ.py", line 25, in <module>
    tcpCliSock, addr = tcpSerSock.accept()
  File "C:\Python27\lib\socket.py", line 200, in accept
    sock, addr = self._sock.accept()
  File "C:\Python27\lib\socket.py", line 170, in _dummy
    raise error(EBADF, 'Bad file descriptor')
socket.error: [Errno 9] Bad file descriptor


'Bad file descriptor'
从来没见过这种错误，达人们讲下啊：）

Bad file descriptor——错误的描述符文件

把代码贴出来，参考一下啊。。。