OSError: [WinError 10038] An operation was attempted on something that is not a socket what is the problem? - chat

Question

im running a chat app on my computer and i tried to send a message and this ERROR accured. it suppose to send a " will joind the chat" and another message " connected to server" after that i should send my message to the group and it didnt worked.
any ideas?
import kivy
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
import socket
import threading
kivy.require("1.9.0")
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
class MyRoot(BoxLayout):
def __init__(self):
super(MyRoot, self).__init__()
def send_message(self):
client.send(f"{self.nickname_text.text}: {self.message_text.text}".encode('utf-8'))
def connect_to_server(self):
if self.nickname_text != "":
client.connect((self.ip_text.text, 9999))
message = client.recv(1024).decode('utf-8')
if message == "NICK":
client.send(self.nickname_text.text.encode('utf-8'))
self.send_btn.disabled = False
self.message_text.disabled = False
self.connect_btn.disabled = True
self.ip_text.disabled = True
self.make_invisible(self.connection_grid)
self.make_invisible(self.connect_btn)
thread = threading.Thread(target=self.receive)
thread.start()
def make_invisible(self, widget):
widget.visible = False
widget.size_hint_x = None
widget.size_hint_y = None
widget.height = 0
widget.width = 0
widget.text = ""
widget.opacity = 0
def receive(self):
stop = False
while not stop:
try:
message = client.recv(1024).decode('utf-8')
self.chat_text.text += message + "\n"
except:
print("ERROR")
client.close()
stop = True
class TraboChat(App):
def build(self):
return MyRoot()
trabo_chat = TraboChat()
trabo_chat.run()
serve.py:
import socket
import threading
HOST = socket.gethostbyname(socket.gethostname())
PORT = 9999
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind((HOST, PORT))
server.listen()
clients = []
nicknames = []
def broadcast(message):
for client in clients:
client.send(message)
def handle_connection(client):
stop = False
while not stop:
try:
message = client.recv(1024)
broadcast(message)
except:
index = clients.index(client)
clients.remove(client)
nickname = nicknames[index]
nicknames.remove(nickname)
broadcast(f"{nickname} left the chat!".encode('utf-8'))
stop = True
def main():
print("server is running..")
while True:
client, addr = server.accept()
print(f"connected to {addr}")
client.send("NICK".encode('utf-8'))
nickname = client.recv(1024).decode('utf-8')
nicknames.append(nickname)
clients.append(client)
print(f"Nickname is {nickname}")
broadcast(f"{nickname} join the chat!")
client.send("You are now connected".encode('utf-8'))
thread = threading.Thread(target=handle_connection, args=(client,))
if name == 'main':
main()