UnicodeDecodeError in Dash app example

Hi, everyone. :wave:

I’m having troubles trying to use the Dash API for the first time. I looked for some tutoriais to try some ideias, but, oddly, I found an error that doesn’t make any sense for me. For the sake of science, I tried the example code “Hello Dash” and I got the same issue.

I tried different codes, python interpreters, but all them get the same “UnicodeDecodeError: ‘utf-8’ codec can’t decode byte 0xf3 in position 5: invalid continuation byte”. There is a similar topic in this forum talking about a split function, but I don’t get what should I do to fix that.

By the way, if I tried to use only the plotly library in a python code, I get the same problem. But, if I do the same thing in a python notebook, it works (just the plotly). So, I guess it could be a problem generation the server (???).

Any ideias? I would appreciate any help.


# -*- coding: utf-8 -*-

# Run this app with `python app.py` and
# visit in your web browser.

import dash
import dash_core_components as dcc
import dash_html_components as html
import plotly.express as px
import pandas as pd

external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']

app = dash.Dash(__name__, external_stylesheets=external_stylesheets)

# assume you have a "long-form" data frame
# see https://plotly.com/python/px-arguments/ for more options
df = pd.DataFrame({
    "Fruit": ["Apples", "Oranges", "Bananas", "Apples", "Oranges", "Bananas"],
    "Amount": [4, 1, 2, 2, 4, 5],
    "City": ["SF", "SF", "SF", "Montreal", "Montreal", "Montreal"]

fig = px.bar(df, x="Fruit", y="Amount", color="City", barmode="group")

app.layout = html.Div(children=[
    html.H1(children='Hello Dash'),

        Dash: A web application framework for Python.


if __name__ == '__main__':


Dash is running on

 * Serving Flask app "app" (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: on
Exception in thread Thread-2:
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\threading.py", line 932, in _bootstrap_inner
  File "C:\ProgramData\Anaconda3\lib\threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "C:\ProgramData\Anaconda3\lib\site-packages\werkzeug\serving.py", line 996, in inner
    srv = make_server(
  File "C:\ProgramData\Anaconda3\lib\site-packages\werkzeug\serving.py", line 847, in make_server
    return ThreadedWSGIServer(
  File "C:\ProgramData\Anaconda3\lib\site-packages\werkzeug\serving.py", line 740, in __init__
    HTTPServer.__init__(self, server_address, handler)
  File "C:\ProgramData\Anaconda3\lib\socketserver.py", line 452, in __init__
  File "C:\ProgramData\Anaconda3\lib\http\server.py", line 140, in server_bind
    self.server_name = socket.getfqdn(host)
  File "C:\ProgramData\Anaconda3\lib\socket.py", line 756, in getfqdn
    hostname, aliases, ipaddrs = gethostbyaddr(name)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xf3 in position 5: invalid continuation byte