how to fix raise ImproperlyConfigured("settings.DATABASES is improperly configured. "

hallo guys,
so i'm having issue deploying my django on railway but once the deployment is complete the app crash with this err

raise ImproperlyConfigured("settings.DATABASES is improperly configured. "
django.core.exceptions.ImproperlyConfigured: settings.DATABASES is improperly configured. Please supply the ENGINE value. Check settings documentation for more details.

and below is my django settings and railway setting

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'HOST': os.environ.get('PGHOST'),
        'NAME': os.environ.get('PGDATABASE'),  
        'USERNAME': os.environ.get('PGUSER'),
        'PASSWORD': os.environ.get('PGPASSWORD'),
        'PORT':os.environ.get('PGPORT')
    }
}

can anyone help out pls