RuntimeError: Model class shop.models.Category doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

[foscraft]

What happened?

Am having the following this error.
Am trying to build an online shop using the cookiecutter.

python manage.py runserver
Watching for file changes with StatReloader
INFO 2020-08-23 11:55:13,654 autoreload 13959 139651660433216 Watching for file changes with StatReloader
Performing system checks...

Exception in thread django-main-thread:
Traceback (most recent call last):
File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
self.run()
File "/usr/lib/python3.8/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/utils/autoreload.py", line 53, in wrapper
fn(*args, **kwargs)
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/core/management/commands/runserver.py", line 117, in inner_run
self.check(display_num_errors=True)
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/core/management/base.py", line 392, in check
all_issues = self._run_checks(
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/core/management/base.py", line 382, in _run_checks
return checks.run_checks(**kwargs)
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/core/checks/registry.py", line 72, in run_checks
new_errors = check(app_configs=app_configs)
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/core/checks/urls.py", line 13, in check_url_config
return check_resolver(resolver)
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/core/checks/urls.py", line 23, in check_resolver
return check_method()
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/urls/resolvers.py", line 407, in check
for pattern in self.url_patterns:
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/utils/functional.py", line 48, in get
res = instance.dict[self.name] = self.func(instance)
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/urls/resolvers.py", line 588, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/utils/functional.py", line 48, in get
res = instance.dict[self.name] = self.func(instance)
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/urls/resolvers.py", line 581, in urlconf_module
return import_module(self.urlconf_name)
File "/usr/lib/python3.8/importlib/init.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 1014, in _gcd_import
File "", line 991, in _find_and_load
File "", line 975, in _find_and_load_unlocked
File "", line 671, in _load_unlocked
File "", line 783, in exec_module
File "", line 219, in _call_with_frames_removed
File "/home/reus/Documents/WORK/elimubora/config/urls.py", line 28, in
path('cart/', include('elimubora.cart.urls',namespace='cart')),
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/urls/conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "/usr/lib/python3.8/importlib/init.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 1014, in _gcd_import
File "", line 991, in _find_and_load
File "", line 975, in _find_and_load_unlocked
File "", line 671, in _load_unlocked
File "", line 783, in exec_module
File "", line 219, in _call_with_frames_removed
File "/home/reus/Documents/WORK/elimubora/elimubora/cart/urls.py", line 2, in
from . import views
File "/home/reus/Documents/WORK/elimubora/elimubora/cart/views.py", line 4, in
from elimubora.cart.cart import Cart
File "/home/reus/Documents/WORK/elimubora/elimubora/cart/cart.py", line 3, in
from shop.models import Book
File "/home/reus/Documents/WORK/elimubora/elimubora/shop/models.py", line 4, in
class Category(models.Model):
File "/home/reus/Documents/WORK/env/lib/python3.8/site-packages/django/db/models/base.py", line 112, in new
raise RuntimeError(
RuntimeError: Model class shop.models.Category doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

My apps look like this:
DJANGO_APPS = [
"django.contrib.auth",
"django.contrib.contenttypes",
"django.contrib.sessions",
"django.contrib.sites",
"django.contrib.messages",
"django.contrib.staticfiles",
# "django.contrib.humanize", # Handy template tags
"django.contrib.admin",
"django.forms",
]

THIRD_PARTY_APPS = [
"crispy_forms",
"allauth",
"allauth.account",
"allauth.socialaccount",
]

LOCAL_APPS = [
"elimubora.users.apps.UsersConfig",
"elimubora.shop.apps.ShopConfig",
"elimubora.cart.apps.CartConfig",
"elimubora.orders.apps.OrdersConfig",
# Your stuff: custom apps go here
]

What should've happened instead?

Steps to reproduce

[luzfcb]

@Nyaribari https://stackoverflow.com/a/61189995

[foscraft]

@luzfcb I have done that but the error still persists.
apps.py:

from django.apps import AppConfig


class ShopConfig(AppConfig):
    name = 'elimubora.shop'

urls.py:

from django.urls import path
from . import views

app_name='shop'

urlpatterns = [
    path(
    route='',
    view=views.book_list,
    name='book_list'
    ),
    path(route='<slug:category_slug>/',
    view=views.book_list,
    name='book_list_by_category'
    ),
    path(route='<int:id>/<slug:slug>/',
    view=views.book_detail,
    name='book_detail'),
]

I have the app in the project-slug:

(env) (base) reus@reus:~/Documents/WORK/elimubora$ ls elimubora/
cart         contrib      media   __pycache__  static     users
conftest.py  __init__.py  orders  shop         templates  utils