Flask ошибка: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xcd in position 0: invalid continuation byte

я пытаюсь запустить приложение на Flask, но выдаёт ошибку:

* Serving Flask app 'hello' (lazy loading)
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production WSGI server instead.
* Debug mode: off
Traceback (most recent call last):
File "C:/Python/flask_blog/hello.py", line 9, in <module>
app.run()
File "C:\Program Files\Python38\lib\site-packages\flask\app.py", line 922, in run
run_simple(t.cast(str, host), port, self, **options)
File "C:\Program Files\Python38\lib\site-packages\werkzeug\serving.py", line 1008, in run_simple
inner()
File "C:\Program Files\Python38\lib\site-packages\werkzeug\serving.py", line 948, in inner
srv = make_server(
File "C:\Program Files\Python38\lib\site-packages\werkzeug\serving.py", line 780, in make_server
return ThreadedWSGIServer(
File "C:\Program Files\Python38\lib\site-packages\werkzeug\serving.py", line 686, in __init__
super().__init__(server_address, handler)  # type: ignore
File "C:\Program Files\Python38\lib\socketserver.py", line 452, in __init__
self.server_bind()
File "C:\Program Files\Python38\lib\http\server.py", line 140, in server_bind
self.server_name = socket.getfqdn(host)
File "C:\Program Files\Python38\lib\socket.py", line 756, in getfqdn
hostname, aliases, ipaddrs = gethostbyaddr(name)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xcd in position 0: invalid continuation byte

Код:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello():
    return 'Hello, World!'
if __name__ == '__main__':
    app.run(port=5000,debug=True)

Как это исправить?