[FIXED] unable to do makemigrations command

Issue

I will give all of you the step that I do before this error happen

btw my superuser=>id:myuser email: pass:myuser

    hostname $ django-admin.py startproject myproj

    hostname $ cd myproj

    hostname $ python manage.py startapp myapp

    hostname $ python manage.py migrate

    hostname $ python manage.py createsuperuser

    hostname $ python manage.py runserver

    hostname $ pip install psycopg2

    hostname $ psql 

    postgres=# create role myuser with createdb superuser 
    login password 'myuser';

    postgres=# create database mydb with owner myuser;

    postgres=# exit

and then I edit the myproj\settings.py, and I run command python manage.py makemigrations myapp and the error bellow happen

Traceback (most recent call last):
  File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\apps\registry.py", line 155, in get_app_config
    return self.app_configs[app_label]
KeyError: 'admin'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\__init__.py", line 401, in execute_from_command_line
    utility.execute()

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\__init__.py", line 395, in execute self.fetch_command(subcommand).run_from_argv(self.argv)

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\base.py", line 328, in run_from_argv
    self.execute(*args, **cmd_options)

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\base.py", line 366, in execute
    self.check()

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\base.py", line 392, in check
    all_issues = self._run_checks(

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\management\base.py", line 382, in _run_checks
    return checks.run_checks(**kwargs)

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\checks\registry.py", line 72, in run_checks
    new_errors = check(app_configs=app_configs)

 File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\checks\urls.py", line 13, in check_url_config
    return check_resolver(resolver)

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\checks\urls.py", line 23, in check_resolver
    return check_method()

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\urls\resolvers.py", line 407, in check
    for pattern in self.url_patterns:

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\utils\functional.py", line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\urls\resolvers.py", line 588, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\utils\functional.py", line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\urls\resolvers.py", line 581, in urlconf_module
    return import_module(self.urlconf_name)

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)

File "<frozen importlib._bootstrap>", line 1014, in _gcd_import

File "<frozen importlib._bootstrap>", line 991, in _find_and_load

File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked

File "<frozen importlib._bootstrap>", line 671, in _load_unlocked

 File "<frozen importlib._bootstrap_external>", line 783, in exec_module

File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed

File "C:\myproj\myproj\urls.py", line 20, in <module>
    path('admin/', admin.site.urls),

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\utils\functional.py", line 224, in inner
    self._setup()

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\contrib\admin\sites.py", line 537, in _setup
    AdminSiteClass = import_string(apps.get_app_config('admin').default_site)

File "C:\Users\userpc\AppData\Local\Programs\Python\Python38\lib\site-packages\django\apps\registry.py", line 162, in get_app_config
    raise LookupError(message)

LookupError: No installed app with label 'admin'.

this is the only file that I modify

myproj/settings.py

import os

    # SECURITY WARNING: keep the secret key used in production secret!
    SECRET_KEY = 'zl@b!)%627#jp-sa40v&yscmvd8r#f^^vi(45z)sqg-c2=o*-e'

    # SECURITY WARNING: don't run with debug turned on in production!
    DEBUG = True

    ALLOWED_HOSTS = []


    # Application definition

    INSTALLED_APPS = [
        'django.contrib.auth',
        'django.contrib.contenttypes',
        'django.contrib.staticfiles',
        # Third party apps
        'rest_framework',
        'rest_framework.authtoken',
        # Internal apps
        'myapp',
    ]

    MIDDLEWARE = [
        'django.middleware.common.CommonMiddleware',
        'django.middleware.csrf.CsrfViewMiddleware',
        'django.middleware.clickjacking.XFrameOptionsMiddleware',
    ]

    ROOT_URLCONF = 'myproj.urls'

    TEMPLATES = [
        {
            'BACKEND': 'django.template.backends.django.DjangoTemplates',
            'DIRS': [],
            'APP_DIRS': True,
            'OPTIONS': {
                'context_processors': [
                    'django.template.context_processors.debug',
                    'django.template.context_processors.request',
                    'django.contrib.auth.context_processors.auth',
                    'django.contrib.messages.context_processors.messages',
                ],
            },
        },
    ]

    WSGI_APPLICATION = 'myproj.wsgi.application'


    # Database
    # https://docs.djangoproject.com/en/3.0/ref/settings/#databases

    DATABASES = {
        'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'mydb',
        'USER': 'myuser',
        'PASSWORD': 'myuser',
        'HOST': 'localhost',
        'PORT': '5432',
        }
    }


    # Password validation
    # https://docs.djangoproject.com/en/3.0/ref/settings/#auth-password-validators

    AUTH_PASSWORD_VALIDATORS = [
        {
            'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
        },
        {
            'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
        },
        {
            'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
        },
        {
            'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
        },
    ]

    LANGUAGE_CODE = 'en-us'

    TIME_ZONE = 'UTC'

    USE_I18N = True

    USE_L10N = True

    USE_TZ = True


    STATIC_URL = '/static/'

Is there anything that I can do??? did I miss something???I'm trying to use an older version django like 2.2.10 but it stil didnt work, when this error happen I used a new version of django and python as well as postgresql too

Solution

Your application is importing admin, but the Django admin is not present in your settings.py.

Add it in INSTALLED_APPS:

INSTALLED_APPS = [ 'django.contrib.admin',  'your.other.applications.follow']

Answered By - ionpoint