Form errors in ListFormsetView created by adding methods to a ListView.

Hello, 

I am consistently getting this bizarre error and formset_invalid is getting triggered.

I just tried to make a generic ListFormSetView.

[11/Jun/2021 12:48:24] "GET /adminuser/print-report/?page=1 HTTP/1.1" 200 5244
[{'PAN_ID': ['User with this Pan ID already exists.']}]
[11/Jun/2021 12:59:29] "POST /adminuser/print-report/?page=2 HTTP/1.1" 200 5250

In my model the USERNAME_FIELD  is PAN_ID.

Webpage looks like this

https://ibb.co/CHT4nKB

Code:

class PrintStatementView(ListFormSetView):

    paginate_by = 1

    model = User

    form_class = PrintReportModelForm

    template_name = "adminuser/printstatement.html"

    context_formset_name = "formset"

    ordering = ("PAN_ID",)

    def get_factory_object(self):

        return modelformset_factory(

            self.model,

            form=self.form_class,

            extra=0,

        )

    def formset_valid(self, formset):

        self.request.session.setdefault("to_download", [])

        self.request.session["to_download"][self.kwargs["page"]] = [

            x["PAN_ID"]

            for x in formset.cleaned_data

            if x["print_report_check"]

        ]

        return HttpResponseRedirect(

            f"{reverse('print-report')}?page={self.kwargs['page']}"

        )

    def get_success_url(self):

        return reverse("adminuser:trading-window-list")

class ListFormSetView(ListView):

    def get_factory_object(self):

        return NotImplementedError(" Implement yourself ")

    def get_context_data(self, *, object_list=None, **kwargs):

        context_formset_name = (

            getattr(self, "context_formset_name", None) or "formset"

        )

        context_data = super().get_context_data(**kwargs)

        object_list = context_data["object_list"]

        context_data[context_formset_name] = self.get_factory_object()(

            queryset=object_list, initial=self.get_initial(object_list)

        )

        return context_data

    def get_form_kwargs(self):

        context_data = super().get_context_data()

        object_list = context_data["object_list"]

        kwargs = {

            "initial": self.get_initial(object_list),

            "queryset": object_list,

        }

        if self.request.method in ("POST", "PUT"):

            kwargs.update(

                {

                    "data": self.request.POST,

                    "files": self.request.FILES,

                }

            )

        return kwargs

    def get_initial(self, queryset=[]):

        """ Generate the initial data for the paginated queryset for the current page"""

        try:

            return self.initial

        except AttributeError:

            data = serializers.serialize("json", queryset)

            data = json.loads(data)

            return data

    def post(self, request, *args, **kwargs):

        self.object_list = self.get_queryset()

        formset = self.get_factory_object()(**self.get_form_kwargs())

        if formset.is_valid():

            return self.formset_valid(formset)

        else:

            return self.formset_invalid(formset)

    def formset_valid(self, formset):

        return HttpResponseRedirect(self.get_success_url())

    def formset_invalid(self, formset):

        print(formset.errors)

        return self.render_to_response(self.get_context_data(formset=formset))

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