Hello,I'm trying to run a ardrone in raspbery pi, but he cannot run application. Writes the error.

Process ARDroneNetworkProcess-1:
Traceback (most recent call last):
File "/usr/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap
self.run()
File "/home/zilvis/drone/arnetwork.py", line 56, in run
nav_socket.bind(('', libardrone.ARDRONE_NAVDATA_PORT))
File "/usr/lib/python2.7/socket.py", line 224, in meth
return getattr(self._sock,name)(*args)
error: [Errno 98] Address already in use

Maybe that will help me?