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Heroku. ImportError: cannot import name 'ugettext_lazy'. How can I edit file into Heroku container?

I have deployed my project to Heroku. But I got "Internal server error"
"ImportError: cannot import name 'ugettext_lazy' from 'django.utils.translation' (/app/.heroku/python/lib/python3.8/site-packages/django/utils/translation/init.py)"
Yes, I know that I should write "gettext_lazy" instead. But I can't find this file in my project. Can I edit code in Heroku container? How?
I got this error only after deploy.
I don't understand where this file is situated.
Help me, please.
Traceback (most recent call last):
File "manage.py", line 22, in <module>
main()
File "manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/management/__init__.py", line 425, in execute_from_command_line
utility.execute()
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/management/__init__.py", line 419, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/management/base.py", line 373, in run_from_argv
self.execute(*args, **cmd_options)
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/management/base.py", line 417, in execute
output = self.handle(*args, **options)
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/management/base.py", line 90, in wrapped
res = handle_func(*args, **kwargs)
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/management/commands/migrate.py", line 75, in handle
self.check(databases=[database])
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/management/base.py", line 438, in check
all_issues = checks.run_checks(
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/checks/registry.py", line 77, in run_checks
new_errors = check(app_configs=app_configs, databases=databases)
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/checks/urls.py", line 13, in check_url_config
return check_resolver(resolver)
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/checks/urls.py", line 23, in check_resolver
return check_method()
File "/app/.heroku/python/lib/python3.8/site-packages/django/urls/resolvers.py", line 446, in check
for pattern in self.url_patterns:
File "/app/.heroku/python/lib/python3.8/site-packages/django/utils/functional.py", line 48, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/app/.heroku/python/lib/python3.8/site-packages/django/urls/resolvers.py", line 632, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/app/.heroku/python/lib/python3.8/site-packages/django/utils/functional.py", line 48, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/app/.heroku/python/lib/python3.8/site-packages/django/urls/resolvers.py", line 625, in urlconf_module
return import_module(self.urlconf_name)
File "/app/.heroku/python/lib/python3.8/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 843, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/app/Bianka/urls.py", line 28, in <module>
path('', include('bianka_site.urls')),
File "/app/.heroku/python/lib/python3.8/site-packages/django/urls/conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "/app/.heroku/python/lib/python3.8/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 843, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/app/bianka_site/urls.py", line 2, in <module>
from . import views
File "/app/bianka_site/views.py", line 8, in <module>
from .forms import CommentForm, LikeForm
File "/app/bianka_site/forms.py", line 3, in <module>
from snowpenguin.django.recaptcha3.fields import ReCaptchaField
File "/app/.heroku/python/lib/python3.8/site-packages/snowpenguin/django/recaptcha3/fields.py", line 7, in <module>
from django.utils.translation import ugettext_lazy as _
ImportError: cannot import name 'ugettext_lazy' from 'django.utils.translation' (/app/.heroku/python/lib/python3.8/site-packages/django/utils/translation/__init__.py)
my requirements.txt
asgiref==3.4.1
backports.zoneinfo==0.2.1
certifi==2021.10.8
charset-normalizer==2.0.10
dj-database-url==0.5.0
Django==4.0
django-ckeditor==6.2.0
django-js-asset==1.2.2
django-modeltranslation==0.17.3
django-recaptcha3==0.4.0
fontawesomefree==6.0.0
gunicorn==20.1.0
idna==3.3
Pillow==8.4.0
psycopg2==2.9.3
requests==2.27.1
six==1.16.0
sqlparse==0.4.2
tzdata==2021.5
urllib3==1.26.7
whitenoise==6.0.0

When I run my Django project developed on Windows on Ubuntu it gives errors as below, even after creating virtualenv and configured properly

Here is the errors
I have installed and created virtualenv as same like the one on Windows and replaced it on Ubuntu with that new one. I could activate the virtual but when I do python3 manage.py runserver it gives error as like below. If someone help, it will be grateful.
Traceback (most recent call last):
File "manage.py", line 22, in <module>
main()
File "manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/home/pema/.local/lib/python3.6/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
utility.execute()
File "/home/pema/.local/lib/python3.6/site-packages/django/core/management/__init__.py", line 413, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/pema/.local/lib/python3.6/site-packages/django/core/management/base.py", line 354, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/pema/.local/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 61, in execute
super().execute(*args, **options)
File "/home/pema/.local/lib/python3.6/site-packages/django/core/management/base.py", line 398, in execute
output = self.handle(*args, **options)
File "/home/pema/.local/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 96, in handle
self.run(**options)
File "/home/pema/.local/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 105, in run
self.inner_run(None, **options)
File "/home/pema/.local/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 118, in inner_run
self.check(display_num_errors=True)
File "/home/pema/.local/lib/python3.6/site-packages/django/core/management/base.py", line 423, in check
databases=databases,
File "/home/pema/.local/lib/python3.6/site-packages/django/core/checks/registry.py", line 76, in run_checks
new_errors = check(app_configs=app_configs, databases=databases)
File "/home/pema/.local/lib/python3.6/site-packages/django/core/checks/urls.py", line 13, in check_url_config
return check_resolver(resolver)
File "/home/pema/.local/lib/python3.6/site-packages/django/core/checks/urls.py", line 23, in check_resolver
return check_method()
File "/home/pema/.local/lib/python3.6/site-packages/django/urls/resolvers.py", line 416, in check
for pattern in self.url_patterns:
File "/home/pema/.local/lib/python3.6/site-packages/django/utils/functional.py", line 48, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/home/pema/.local/lib/python3.6/site-packages/django/urls/resolvers.py", line 602, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/home/pema/.local/lib/python3.6/site-packages/django/utils/functional.py", line 48, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/home/pema/.local/lib/python3.6/site-packages/django/urls/resolvers.py", line 595, in urlconf_module
return import_module(self.urlconf_name)
File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 994, in _gcd_import
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/home/pema/Desktop/Django/devsearch/devsearch/urls.py", line 9, in <module>
path("", include("users.urls"))
File "/home/pema/.local/lib/python3.6/site-packages/django/urls/conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 994, in _gcd_import
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/home/pema/Desktop/Django/devsearch/users/urls.py", line 3, in <module>
from. import views
File "/home/pema/Desktop/Django/devsearch/users/views.py", line 8, in <module>
from .forms import CustomUserCreationForm, ProfileForm, SkillForm
File "/home/pema/Desktop/Django/devsearch/users/forms.py", line 1, in <module>
from dataclasses import fields
ModuleNotFoundError: No module named 'dataclasses'

Data classes were introduced in Python 3.7. You are running Python 3.6.

How to adding PDF for Admin to view Orders

I have tried to add the option to view order through PDF in the admin panel but I am getting error which I do not know the reason for nor how to fix it.
This is what I did step by step. The issue is now that I have tried restart everything but I am still getting the error.
$ pip install weasyprint django-import-export
then I added it in the installed apps 'import_export',
Here is the admin.py
def order_pdf(obj):
return mark_safe('PDF'.format(reverse('orders:admin_order_pdf', args=[obj.id])))
order_pdf.short_description = 'Order PDF'
class OrderAdmin(ImportExportActionModelAdmin):
list_display = ['id', order_pdf]
here is the views.py
#staff_member_required
def admin_order_pdf(request,order_id):
Order = get_object_or_404(order,id=order_id)
html = render_to_string('order/pdf.html',{'order':Order})
response = HttpResponse(content_type='application/pdf')
response['Content-Disposition'] = 'filename="order_{}.pdf"'.format(Order.id)
# weasyprint.HTML(string=html).write_pdf(response,stylesheets=[weasyprint.CSS(settings.STATIC_ROOT + 'css/pdf.css')])
weasyprint.HTML(string=html).write_pdf(response,stylesheets=[weasyprint.CSS(settings.STATIC_ROOT)])
return response
here is the url.py
path('admin/order/(?P<order_id>\d+)/pdf/$', views.admin_order_pdf, name='admin_order_pdf')
Here is the traceback
Traceback (most recent call last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\management\commands\runserver.py", line 60, in execute
super().execute(*args, **options)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\management\base.py", line 364, in execute
output = self.handle(*args, **options)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\management\commands\runserver.py", line 95, in handle
self.run(**options)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\management\commands\runserver.py", line 102, in run
autoreload.run_with_reloader(self.inner_run, **options)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\utils\autoreload.py", line 579, in run_with_reloader
start_django(reloader, main_func, *args, **kwargs)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\utils\autoreload.py", line 564, in start_django
reloader.run(django_main_thread)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\utils\autoreload.py", line 272, in run
get_resolver().urlconf_module
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\utils\functional.py", line 80, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\urls\resolvers.py", line 564, in urlconf_module
return import_module(self.urlconf_name)
File "C:\Users\A_K\AppData\Local\Programs\Python\Python38-32\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:\Users\A_K\Desktop\Project 4.3\Moustiques\urls.py", line 15, in <module>
path('', include('core.urls', namespace='core')),
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\urls\conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "C:\Users\A_K\AppData\Local\Programs\Python\Python38-32\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
Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\Users\A_K\AppData\Local\Programs\Python\Python38-32\lib\threading.py", line 932, in _bootstrap_inner
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
self.run()
File "C:\Users\A_K\AppData\Local\Programs\Python\Python38-32\lib\threading.py", line 870, in run
File "C:\Users\A_K\Desktop\Project 4.3\core\urls.py", line 3, in <module>
self._target(*self._args, **self._kwargs)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
from . import views
File "C:\Users\A_K\Desktop\Project 4.3\core\views.py", line 6, in <module>
fn(*args, **kwargs)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\management\commands\runserver.py", line 117, in inner_run
import weasyprint
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\weasyprint\__init__.py", line 440, in <module>
self.check(display_num_errors=True)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\management\base.py", line 387, in check
from .css import preprocess_stylesheet # noqa isort:skip
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\weasyprint\css\__init__.py", line 30, in <module>
all_issues = self._run_checks(
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\management\base.py", line 377, in _run_checks
from . import computed_values, media_queries
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\weasyprint\css\computed_values.py", line 18, in <module>
return checks.run_checks(**kwargs)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\checks\registry.py", line 72, in run_checks
from .. import text
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\weasyprint\text.py", line 14, in <module>
new_errors = check(app_configs=app_configs)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\checks\urls.py", line 40, in check_url_namespaces_unique
import cairocffi as cairo
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\cairocffi\__init__.py", line 48, in <module>
all_namespaces = _load_all_namespaces(resolver)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\core\checks\urls.py", line 57, in _load_all_namespaces
cairo = dlopen(
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\cairocffi\__init__.py", line 45, in dlopen
url_patterns = getattr(resolver, 'url_patterns', [])
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\utils\functional.py", line 80, in __get__
raise OSError(error_message) # pragma: no cover
OSError: no library called "cairo" was found
no library called "libcairo-2" was found
cannot load library 'libcairo.so': error 0x7e
cannot load library 'libcairo.2.dylib': error 0x7e
cannot load library 'libcairo-2.dll': error 0x7e res = instance.__dict__[self.name] = self.func(instance)
File "C:\Users\A_K\Desktop\Project 4.3\venv\lib\site-packages\django\urls\resolvers.py", line 571, in url_patterns

weasyprint or django-import-export is dependent on libcairo is a shared library. Some python packages are automatically compiled with all the dependencies, but this is not the case. If you don't want to figure out how to install libcairo yourself, I would suggest that you use Anaconda, which does a good job at installing dependencies on Windows.
https://www.anaconda.com/products/individual
I verified that Anaconda has the cairocffi package, which is the python wrapper around the libcairo that triggers the error.
https://anaconda.org/conda-forge/cairocffi

LookupError: No installed app with label 'admin'. when I tried running a program using Django

I was trying to run a python program on my computer, the command I use is
py -3 manage.py runserver,
but I ran into an error and I couldn't find any helpful posts online that can solve this problem.
Python version is Python 3.7.3
Django version is 2.2
Here is the error message:
Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\threading.py", line 917, in _bootstrap_inner
self.run()
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
fn(*args, **kwargs)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\commands\runserver.py", line 109, in inner_run
autoreload.raise_last_exception()
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\utils\autoreload.py", line 77, in raise_last_exception
raise _exception[0](_exception[1]).with_traceback(_exception[2])
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
fn(*args, **kwargs)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\apps\registry.py", line 114, in populate
app_config.import_models()
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\apps\config.py", line 211, in import_models
self.models_module = import_module(models_module_name)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\Desktop\Intern\Diversity_Policy_Site\blog\models.py", line 4, in <module>
from .search import PolicyIndex
File "C:\Users\Desktop\Intern\Diversity_Policy_Site\blog\search.py", line 14, in <module>
connections.create_connection(hosts=["https://dd90577b842c4f9396ca1846612e98df.us-east-1.aws.found.io:9243"], http_auth=('elastic', 'Mq2jdfPLSRG1m8qxp4vd0qNa'))
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\elasticsearch_dsl\connections.py", line 66, in create_connection
conn = self._conns[alias] = Elasticsearch(**kwargs)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\elasticsearch\client\__init__.py", line 206, in __init__
self.transport = transport_class(_normalize_hosts(hosts), **kwargs)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\elasticsearch\transport.py", line 108, in __init__
self.set_connections(hosts)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\elasticsearch\transport.py", line 157, in set_connections
connections = list(zip(connections, hosts))
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\elasticsearch\transport.py", line 154, in _create_connection
return self.connection_class(**kwargs)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\elasticsearch\connection\http_urllib3.py", line 161, in __init__
"Root certificates are missing for certificate "
elasticsearch.exceptions.ImproperlyConfigured: Root certificates are missing for certificate validation. Either pass them in using the ca_certs parameter or install certifi to use it automatically.
Traceback (most recent call last):
File "C:\Users\AppData\Local\Programs\Python\Python37\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 15, in <module>
execute_from_command_line(sys.argv)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\commands\runserver.py", line 60, in execute
super().execute(*args, **options)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\base.py", line 364, in execute
output = self.handle(*args, **options)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\commands\runserver.py", line 95, in handle
self.run(**options)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\commands\runserver.py", line 102, in run
autoreload.run_with_reloader(self.inner_run, **options)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\utils\autoreload.py", line 579, in run_with_reloader
start_django(reloader, main_func, *args, **kwargs)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\utils\autoreload.py", line 564, in start_django
reloader.run(django_main_thread)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\utils\autoreload.py", line 272, in run
get_resolver().urlconf_module
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\utils\functional.py", line 80, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\urls\resolvers.py", line 564, in urlconf_module
return import_module(self.urlconf_name)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\Desktop\Intern\Diversity_Policy_Site\mysite\urls.py", line 22, in <module>
path('admin/', admin.site.urls),
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\utils\functional.py", line 256, in inner
self._setup()
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\contrib\admin\sites.py", line 529, in _setup
AdminSiteClass = import_string(apps.get_app_config('admin').default_site)
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\django\apps\registry.py", line 162, in get_app_config
raise LookupError(message)
LookupError: No installed app with label 'admin'.
The above code is the error I have, the posts I found online were not helpful.

type this command in cmd:
pip install certifi
and the above error should be solved.

Getting error for created new app in python

i am new in python, I have created new app as crud, i am using django, app is created, but when i run the server it gives me below error, not getting what exactl error in that, In mysite/settings.py i have added in INSTALLED_APPS added crud.apps.CrudConfig still getting this error
C:\Users\Nikul\PycharmProjects\mysite>python manage.py runserver
Watching for file changes with StatReloader
Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\threading.py", line 917, in _bootstrap_inner
self.run()
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
fn(*args, **kwargs)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\commands\runserver.py", line 109, in inner_run
autoreload.raise_last_exception()
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\utils\autoreload.py", line 77, in raise_last_exception
raise _exception[0](_exception[1]).with_traceback(_exception[2])
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
fn(*args, **kwargs)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\apps\registry.py", line 91, in populate
app_config = AppConfig.create(entry)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\apps\config.py", line 134, in create
% (mod_path, cls_name, ', '.join(candidates))
django.core.exceptions.ImproperlyConfigured: 'crud.apps' does not contain a class 'CrudConfig'. Choices are: 'PollsConfig'.
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\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\commands\runserver.py", line 60, in execute
super().execute(*args, **options)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\base.py", line 364, in execute
output = self.handle(*args, **options)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\commands\runserver.py", line 95, in handle
self.run(**options)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\commands\runserver.py", line 102, in run
autoreload.run_with_reloader(self.inner_run, **options)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\utils\autoreload.py", line 579, in run_with_reloader
start_django(reloader, main_func, *args, **kwargs)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\utils\autoreload.py", line 564, in start_django
reloader.run(django_main_thread)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\utils\autoreload.py", line 272, in run
get_resolver().urlconf_module
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\utils\functional.py", line 80, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\urls\resolvers.py", line 564, in urlconf_module
return import_module(self.urlconf_name)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\Nikul\PycharmProjects\mysite\mysite\urls.py", line 22, in <module>
path('crud/', include('crud.urls')),
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\urls\conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\Nikul\PycharmProjects\mysite\crud\urls.py", line 3, in <module>
from . import views
File "C:\Users\Nikul\PycharmProjects\mysite\crud\views.py", line 8, in <module>
from .models import Choice, Question
File "C:\Users\Nikul\PycharmProjects\mysite\crud\models.py", line 8, in <module>
class Question(models.Model):
File "C:\Users\Nikul\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\base.py", line 111, in __new__
"INSTALLED_APPS." % (module, name)
RuntimeError: Model class crud.models.Question doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.
Can anyone please help me what we need to do to resolve that error ?