How do I fix connectionreseterror: [errno 104] connection reset by peer

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Python

Python3.6

I'm relatively new to python and I'm trying to make a simple GUI chat with python. It is programmed to ask for a nickname when a client joins the server. All works fine until the part where I enter the nickname. When I enter the nickname I get these errors from the server and client respectively, I'll provide the tracebacks as well.

ConnectionResetError: [Errno 104] Connection reset by peer

(From server)

traceback:

Traceback (most recent call last):
  File "server.py", line 51, in <module>
    receive()
  File "server.py", line 44, in receive
    broadcast(f"{nickname} entered to the chat!\n".encode('utf-8'))
  File "server.py", line 17, in broadcast
    client.send(message)

TypeError: can't set attributes of built-in/extension type 'set'

(from client)

traceback:

Traceback (most recent call last):
  File "C:/Users/ISINDU WICKRAMASEKAR/PycharmProjects/guichat/client.py", line 94, in <module>
    client = Client(HOST, PORT)
  File "C:/Users/ISINDU WICKRAMASEKAR/PycharmProjects/guichat/client.py", line 22, in __init__
    set.gui_done = False

The code for the server and client are also linked.


server -> Server - Pastebin.com[^]

client-> Client - Pastebin.com[^]

What I have tried:

I tried googling for answers and I can't say I didn't get any, but I didn't understand how to implement those solutions for my issue. These are the links I referred to

1. ubuntu - Python handling socket.error: [Errno 104] Connection reset by peer - Stack Overflow[^]

2.python can't set attributes of built-in/extension type 'object' - Stack Overflow[^]