OSError with Pybluez librairy

Question

I would like to make a bluetooth communication between a laptop with a bluetooth dongle and windows 7, and my raspberry pi 3.

I found on internet some tutorials which use the Pybluez librairy but this doesn't work for me.

Find below the code for the server part :

import bluetooth

Host = ""
port = 12

HostAddr = (Host, port)

def setupServer():
    server_socket=bluetooth.BluetoothSocket( bluetooth.RFCOMM )
    print("Socket Created.")
    server_socket.bind(HostAddr)
    server_socket.listen(1)
    print("Socket bind complete")

    client_sock, client_info = server_socket.accept()
    print("Accepted connection from " , client_info)

    try:
        while True:
            data = client_sock.recv(1024)
            if len(data) == 0: break
            print("received [%s]" %data)
    except IOError:
        pass

    print("Disconnected")

client_sock.close()
server_socket.close()
print("all done")

setupServer()

This is the output :

Socket Created.
Traceback (most recent call last):
  File "path_to_file\Server.py", line 33, in <module>
setupServer()
  File "path_to_file\Server.py", line 12, in setupServer
server_socket.bind(HostAddr)
  File "C:\Python34\lib\site-packages\bluetooth\msbt.py", line 60, in bind
bt.bind (self._sockfd, addr, port)
OSError

Do you have an idea why i had this error ?