Daphne ModuleNotFoundError: No module named 'app_name'

When I run daphne -b 0.0.0.0 -p 8000 --access-log=daphne.log config.asgi:application I get Daphne ModuleNotFoundError: No module named 'app_name'

But when I run python3 manage.py runserver it works normally? When I remove app_1 from INSTALLED_APPS it will show me ModuleNotFoundError: No module named 'app_2'

This is my folder structure:

project_name
│   __init__.py    
│   manage.py    
│ 
└───config
│   │   __init__.py
│   │   asgi.py
│   │   celery.py
│   │   urls.py
│   │   wsgi.py
│   │
│   └───settings
│       │
│       │   __init__.py
│       │   base.py
│       │   dev.py
│       │   prod.py
│       
│
└───project_name
│   │   __init__.py
│   │
│   └───app_1
│   └───app_2
│   └───app_3
│   
└───media
│ 
└───static

asgi.py:

from django.core.asgi import get_asgi_application


django_asgi_app = get_asgi_application()


from channels.auth import AuthMiddlewareStack
from channels.routing import ProtocolTypeRouter, URLRouter

from chat import routing


os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'config.settings.dev')

application = ProtocolTypeRouter({
    'http': django_asgi_app,
    'websocket': AuthMiddlewareStack(
        URLRouter(
            routing.websocket_urlpatterns
        )
    ),
})

I had to append the folder where all my apps lie to the PYTHONPATH environment variable like so: PYTHONPATH="${PYTHONPATH}:/project_name/project_name"