Получение "AuthToken.user" должно быть экземпляром "User". в django-rest-knox register api и использование Custom django user

Я создаю login и signup api с использованием django rest frame work. Я создал пользовательского пользователя и использую библиотеку django-rest-knox для аутентификации. Я получаю ошибку "AuthToken.user" должен быть экземпляром "User".

Определение пользовательского пользователя

class User(AbstractBaseUser):
    email = models.EmailField(verbose_name='email_address', max_length=255, unique=True,)
    full_name = models.CharField(max_length=255)
    is_active = models.BooleanField(default=True)
    staff = models.BooleanField(default=False)
    admin = models.BooleanField(default=False)
    phone_number = PhoneNumberField(region='NG', blank=True)

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['full_name', 'phone_number'] # Email & Password are required by default.

    def get_full_name(self):
        # The user is identified by their email address
        return self.full_name

    def get_short_name(self):
        # The user is identified by their email address
        return self.email

    def __str__(self):
        return self.email

    def has_perm(self, perm, obj=None):
        "Does the user have a specific permission?"
        # Simplest possible answer: Yes, always
        return True

    def has_module_perms(self, app_label):
        "Does the user have permissions to view the app `app_label`?"
        # Simplest possible answer: Yes, always
        return True

    @property
    def is_staff(self):
        "Is the user a member of staff?"
        return self.staff

    @property
    def is_admin(self):
        "Is the user a admin member?"
        return self.admin
    
    objects = UserManager()

Зарегистрировать сериализатор

class RegisterSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ('id', 'full_name', 'email', 'phone_number', 'password')
        extra_kwargs = {'password': {'write_only': True}}

    def create(self, validated_data):
        user = User.objects.create_user(validated_data['email'], validated_data['full_name'], validated_data['phone_number'], validated_data['password'])

        return user

Зарегистрируйте API

class RegisterAPI(generics.GenericAPIView):
    serializer_class = RegisterSerializer

    def post(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        user = serializer.save()
        token = AuthToken.objects.create(user)[1]
        return Response({
            "User": UserSerializer(user, context=self.get_serializer_context()).data,
            "Token": token
        })

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