Регистрация и вход не работают в производстве в DigitalOcean при использовании DjangoRestFramework и получении серверной ошибки 500

Я следовал документации DigitalOcean, чтобы загрузить свое приложение Django на DigitalOcean: https://docs.digitalocean.com/developer-center/deploy-a-django-app-on-app-platform/ И я обслуживал свои статические файлы и медиафайлы, используя пространство DigitalOcean, и все хорошо, и я могу делать все свои запросы в производстве, но Login & Sign up работает только на моей локальной машине, но не на сервере DigitalOcean Я получаю ошибку сервера 500

вот моя конфигурация :

settings.py:

---

Serializers.py

class UserSerializer(serializers.ModelSerializer):
#   The Meta class specifies that we are interested
class Meta:
    model = User
    fields = ["id", "first_name", "last_name",
              "username", "password", "email"]
    extra_kwargs = {'password': {'write_only': True}}

---

apis.py

@permission_classes((AllowAny,))

@csrf_exempt

def user_sign_up(request):

if request.method == "POST":

    #   user data
    serializer = UserSerializer(data=request.POST)
    #   typed username
    username = request.POST.get('username')
    password = request.POST.get('password')
    first_name = request.POST.get('first_name')
    last_name = request.POST.get('last_name')

    #   typed email
    email = request.POST.get('email')
    if User.objects.filter(username=username).exists():
        return JsonResponse({"dublicated username": "your username already exists, try another username"})

    elif User.objects.filter(email=email).exists():
        return JsonResponse({"dublicated email": "your email already exists, try another email"})

    else:

        #   generating access token for each user
        expire_seconds = oauth2_settings.ACCESS_TOKEN_EXPIRE_SECONDS
        scopes = oauth2_settings.user_settings['SCOPES']
        application = Application.objects.get(name="test_app_name")
        expires = datetime.datetime.now() + timedelta(seconds=expire_seconds)

        if serializer.is_valid():
            user = User.objects.create_user(username, email, password)
            user.first_name = first_name
            user.last_name = last_name
            user.save()
            access_token = AccessToken.objects.create(user=User.objects.all().get(username=username),
                                                      application=application,
                                                      token=generate_token(),
                                                      expires=expires,
                                                      scope=scopes)

            user_type = request.POST.get('user_type')
            if user_type == "driver":
                driver = Driver.objects.get_or_create(
                    user_id=User.objects.all().get(username=username).id)
            elif user_type == "customer":
                customer = Customer.objects.get_or_create(
                    user_id=User.objects.all().get(username=username).id)

            # user_data = []
            # user_data.append(serializer.data)
            # user_data.append(access_token.token)
    return JsonResponse({"registered_user": serializer.data, "access_token": access_token.token})
else:
    return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

---

urls.py

---

path('user/sign_up/', apis.user_sign_up), #=> 
but unfortunately it gave me server error 500 but it works in localhost perfectly
 I don't know where is the problem

---

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