"detail": "Method \"GET\" not allowed." Django Rest Framework

I know this question maybe a duplicate, but I have tried many solutions and could not understand any. I have followed this tutorial exactly and yet I get this error on the 'userlist' page. Everything else works just fine. Can somebody point out what the error is ?

class UserList(APIView):
"""
Create a new user. It's called 'UserList' because normally we'd have a get
method here too, for retrieving a list of all User objects.
"""

permission_classes = (permissions.AllowAny,)
http_method_names = ['get', 'head']

def post (self, request, format=None):
    self.http_method_names.append("GET")

    serializer = UserSerializerWithToken(data=request.data)
    if serializer.is_valid():
        serializer.save()
        return Response(serializer.data, status=status.HTTP_201_CREATED)
    return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

EDIT: urls.py

from django.urls import include, path
from classroom.views.classroom import current_user, UserList
from .views import classroom, suppliers, teachers
urlpatterns = [path('', classroom.home, name='home'),
               path('current_user/', current_user),
               path('users/', UserList.as_view()),

Edit:

Still getting this error,

You need to add GET endpoint url to your urls.py in order to use GET requests. GET url is missing in your urls.py, simply edit your urls.py like:

# urls.py

from django.urls import include, path
from classroom.views.classroom import current_user, UserList
from .views import classroom, suppliers, teachers

urlpatterns = [
               path('', classroom.home, name='home'),
               path('current_user/', current_user),
               path('users/', UserList.as_view()),
               path('users/<int:pk>/', UserList.as_view()),
              ]

And you need to implement get method in yourUserList view such as:

# views.py

class UserList(APIView):
    """
    Create a new user. It's called 'UserList' because normally we'd have a get
    method here too, for retrieving a list of all User objects.
    """

    permission_classes = (permissions.AllowAny,)
    http_method_names = ['get', 'head']


    def get(self, request, format=None):
        users = User.objects.all()
        serializer = UserSerializerWithToken(users, many=True)
        return Response(serializer.data)

    def post(self, request, format=None):
        self.http_method_names.append("GET")

        serializer = UserSerializerWithToken(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)