How to fix DetailView is missing a QuerySet Error?

When I try to use DetailView to view my posts I keep getting an exception error.

ImproperlyConfigured at /musician_details/1/ DetailView is missing a QuerySet. Define DetailView.model, DetailView.queryset, or override DetailView.get_queryset(). Request Method: GET Request URL: http://127.0.0.1:8000/musician_details/1/ Django Version: 3.2.5 Exception Type: ImproperlyConfigured Exception Value:
DetailView is missing a QuerySet. Define DetailView.model, DetailView.queryset, or override DetailView.get_queryset(). Exception Location: C:\Program Files\Python38\lib\site-packages\django\views\generic\detail.py, line 69, in get_queryset Python Executable: C:\Program Files\Python38\python.exe Python Version: 3.8.2 Python Path:
['F:\Full Stack\Django\Django Project\Test', 'C:\Program Files\Python38\python38.zip', 'C:\Program Files\Python38\DLLs', 'C:\Program Files\Python38\lib', 'C:\Program Files\Python38', 'C:\Users\Tanim\AppData\Roaming\Python\Python38\site-packages', 'C:\Program Files\Python38\lib\site-packages', 'C:\Program Files\Python38\lib\site-packages\win32', 'C:\Program Files\Python38\lib\site-packages\win32\lib', 'C:\Program Files\Python38\lib\site-packages\Pythonwin'] Server time: Sun, 19 Sep 2021 07:44:37 +0000

views.py

from django.shortcuts import render
from django.http import HttpResponse
from django.views.generic import View, TemplateView, ListView, DetailView
from home import models


class IndexView(ListView):
  

    context_object_name = 'musician_list'
    model = models.Musician
    template_name = 'first_app/index.html'


class MusicianDetail(DetailView):
    context_object_name = 'musician'
    model = models.Musician
    template_name = 'first_app/musician_details.html'

models.py

from django.db import models

# Create your models here.       
class Musician(models.Model):    
    first_name=models.CharField(max_length=50)
    last_name=models.CharField(max_length=50)
    instrument=models.CharField(max_length=50)

    def __str__(self):
        return self.first_name + " " + self.last_name        
   
class Album(models.Model):
    artist=models.ForeignKey(Musician, on_delete=models.CASCADE)
    name=models.CharField(max_length=100)
    release_date=models.DateField()    
    rating=(
    (1,"Worst"),
    (2,"Bad"),
    (3,"Not Bad"),
    (4,"Good"),
    (5,"Excellent!"),    
    )        
    num_Stars=models.IntegerField(choices=rating)
          
    def __str__(self):
        return self.name +", Rating: " +str(self.num_Stars)
    

models.py

from django.contrib import admin
from django.urls import path
from home import views

app_name = "home"

urlpatterns = [
    path('', views.IndexView.as_view(), name='index'),
    path('musician_details/<pk>/', views.DetailView.as_view(), name='musician_details'),    
]

index.html

{% extends 'first_app/base.html' %}
{% block body_block %}

<ul>

{% for musician in musician_list %}

<li><a href="{% url 'home:musician_details' pk=musician.pk %}">{{musician.first_name}} {{musician.last_name}}</a> </li>  

{% endfor %}

</ul>

{% endblock %}  

musician_details.html

{% extends 'first_app/base.html' %}
{% block body_block %}

<h3>Musician Details:</h3>
<p>{{musician.first_name}} {{musician.last_name}}</p>
<p>{{musician.instrument}}</p>

{% endblock %} 

Your DetailView URL pattern in urls.py is wrong.

You need to use /<int:pk>/ not /<pk>/.

You also used DetailView so fix it to be MusicianDetail. That is, You call your musician detail view MusicianDetail, so in order to have valid URLs, you have to use MusicianDetail in your urls.py. DetailView is nothing but parent class to create detail view in the Django projects.

urlpatterns = [
    path('', views.IndexView.as_view(), name='index'),
    path('musician_details/<int:pk>/', views. MusicianDetail.as_view(), name='musician_details'),    
]