Document code error - Githubissues

Hi, I'm going to document my code, here is my code: card.py

import random

class Card:
    """
    The Card class represents a single playing card and is initialised by passing a suit and number.
    """
    def __init__(self, suit, number):
        self._suit = suit
        self._number = number

    def __repr__(self):
        return self._number + " of " + self._suit

    @property
    def suit(self):
        """ Gets or sets the suit of the Card """
        return self._suit

    @suit.setter
    def suit(self, suit):
        # there is no need for a docstring on a setter
        if suit in ["hearts", "clubs", "diamonds", "spades"]:
            self._suit = suit
        else:
            print("That's not a suit!")

    @property
    def number(self):
        return self._number

    @number.setter
    def number(self, number):
        valid = [str(n) for n in range(2,11)] + ["J", "Q", "K", "A"]
        if number in valid:
            self._number = number
        else:
            print("That's not a valid number")

class Deck:
    """
    The Card class represents a single playing card and is initialised by passing a suit and number.
    """
    def __init__(self):
        self._cards = []
        self.populate()

    def populate(self):
        suits = ["hearts", "clubs", "diamonds", "spades"]
        numbers = [str(n) for n in range(2,11)] + ["J", "Q", "K", "A"]
        self._cards = [ Card(s, n) for s in suits for n in numbers ]

    def shuffle(self):
        random.shuffle(self._cards)

    def deal(self, no_of_cards):
        dealt_cards = []
        for i in range(no_of_cards):
            dealt_card = self._cards.pop(0)
            dealt_cards.append(dealt_card)
        return dealt_cards

    def __repr__(self):
        cards_in_deck = len(self._cards)
        return "Deck of " + str(cards_in_deck) + " cards"

deck = Deck()
print(deck)

code.rst

Code docs
=========
.. module:: card
.. autoclass:: Card
    :members:

index.rst

.. card documentation master file, created by
   sphinx-quickstart on Sat May 29 10:49:28 2021.
   You can adapt this file completely to your liking, but it should at least
   contain the root `toctree` directive.

Welcome to card's documentation!
================================

.. toctree::
   :maxdepth: 2
   :caption: Contents:

   code

Indices and tables
==================

* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`

index.html


<!DOCTYPE html>

<html>
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />

    <title>Welcome to card’s documentation! &#8212; card 0.1 documentation</title>
    <link rel="stylesheet" type="text/css" href="_static/pygments.css" />
    <link rel="stylesheet" type="text/css" href="_static/alabaster.css" />
    <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js"></script>
    <script src="_static/jquery.js"></script>
    <script src="_static/underscore.js"></script>
    <script src="_static/doctools.js"></script>
    <link rel="index" title="Index" href="genindex.html" />
    <link rel="search" title="Search" href="search.html" />
    <link rel="next" title="Code docs" href="code.html" />

  <link rel="stylesheet" href="_static/custom.css" type="text/css" />

  <meta name="viewport" content="width=device-width, initial-scale=0.9, maximum-scale=0.9" />

  </head><body>

    <div class="document">
      <div class="documentwrapper">
        <div class="bodywrapper">

          <div class="body" role="main">

  <section id="welcome-to-card-s-documentation">
<h1>Welcome to card’s documentation!<a class="headerlink" href="#welcome-to-card-s-documentation" title="Permalink to this headline">¶</a></h1>
<div class="toctree-wrapper compound">
<p class="caption"><span class="caption-text">Contents:</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="code.html">Code docs</a></li>
</ul>
</div>
</section>
<section id="indices-and-tables">
<h1>Indices and tables<a class="headerlink" href="#indices-and-tables" title="Permalink to this headline">¶</a></h1>
<ul class="simple">
<li><p><a class="reference internal" href="genindex.html"><span class="std std-ref">Index</span></a></p></li>
<li><p><a class="reference internal" href="py-modindex.html"><span class="std std-ref">Module Index</span></a></p></li>
<li><p><a class="reference internal" href="search.html"><span class="std std-ref">Search Page</span></a></p></li>
</ul>
</section>

          </div>

        </div>
      </div>
      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
        <div class="sphinxsidebarwrapper">
<h1 class="logo"><a href="#">card</a></h1>

<h3>Navigation</h3>
<p class="caption"><span class="caption-text">Contents:</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="code.html">Code docs</a></li>
</ul>

<div class="relations">
<h3>Related Topics</h3>
<ul>
  <li><a href="#">Documentation overview</a><ul>
      <li>Next: <a href="code.html" title="next chapter">Code docs</a></li>
  </ul></li>
</ul>
</div>
<div id="searchbox" style="display: none" role="search">
  <h3 id="searchlabel">Quick search</h3>
    <div class="searchformwrapper">
    <form class="search" action="search.html" method="get">
      <input type="text" name="q" aria-labelledby="searchlabel" />
      <input type="submit" value="Go" />
    </form>
    </div>
</div>
<script>$('#searchbox').show(0);</script>

        </div>
      </div>
      <div class="clearer"></div>
    </div>
    <div class="footer">
      &copy;2021, Nam.

      |
      Powered by <a href="http://sphinx-doc.org/">Sphinx 4.0.2</a>
      &amp; <a href="https://github.com/bitprophet/alabaster">Alabaster 0.7.12</a>

      |
      <a href="_sources/index.rst.txt"
          rel="nofollow">Page source</a>
    </div>

  </body>
</html>

So when i run the code, it's work perfectly, withwhen i click on the "code docs", so it's not shows any code

Environment info

OS: Windows 7 32 bit
Python version: 3.8.10
Sphinx version: 4.0.2
Sphinx extensions: None
Extra tools: Google Chrome browser

sphinx-doc / sphinx

Document code error #9286