please help me to debud my local chat network program

[Minh Dang]

Hello everybody, i am doing my project: local network chat using python
here is my file
http://www.mediafire.com/?cc2g9tmsju0ba2m
when i compile client.py, there is some bug
Traceback (most recent call last):
File "C:\Users\MINH_IT\workspace\project\src\project\pclient.py", line 303, in <module>
sys.exit(main())
File "C:\Users\MINH_IT\workspace\project\src\project\pclient.py", line 42, in main
servIP = broadcast()
File "C:\Users\MINH_IT\workspace\project\src\project\pclient.py", line 79, in broadcast
udpSock.bind((broadcastIP, broadcastPort))
OSError: [WinError 10049] The requested address is not valid in its context
Please help me to debud it, thank so much.