TemplateDoesNotExist at /dashboard/catalogue/product-type/1/update/

[xedi...@gmail.com]

I have forked django oscar for customization and adding much more features as per the project needs however, i am getting an error of  TemplateDoesNotExist at /dashboard/catalogue/product-type/1/update/ and it shows the following in the exception 

The template structure is 

templates

  basket

  catalogue

  dashboard

Exception Type:	TemplateDoesNotExist
Exception Value:	dashboard/widgets/related_widget_wrapper.html

import copy

import re

from django.forms import Widget

from django.urls import reverse

class RelatedFieldWidgetWrapper(Widget):

    """

    This class is a wrapper to a given widget to add the add icon for the

    pfurniture dashboard.

    """

    template_name = 'dashboard/widgets/related_widget_wrapper.html'

    IS_POPUP_VALUE = '1'

    IS_POPUP_VAR = '_popup'

    TO_FIELD_VAR = '_to_field'

    def __init__(self, widget, rel):

        self.needs_multipart_form = widget.needs_multipart_form

        self.attrs = widget.attrs

        self.choices = widget.choices

        self.widget = widget

        self.rel = rel

    def __deepcopy__(self, memo):

        obj = copy.copy(self)

        obj.widget = copy.deepcopy(self.widget, memo)

        obj.attrs = self.widget.attrs

        memo[id(self)] = obj

        return obj

    @property

    def is_hidden(self):

        return self.widget.is_hidden

    @property

    def media(self):

        return self.widget.media

    def get_related_url(self, info, action, *args):

        app_label = info[0]

        model_object_name = info[1]

        print('info', info, action)

        # Convert the model's object name into lowercase, with dashes between

        # the camel-cased words

        model_object_name = '-'.join(re.sub('([a-z])([A-Z])', r'\1 \2', model_object_name).lower().split())

        # Does not specify current app

        return reverse("dashboard:%s-%s-%s" % (app_label, model_object_name, action), args=args)

    def get_context(self, name, value, attrs):

        rel_opts = self.rel.model._meta

        info = (rel_opts.app_label, rel_opts.object_name)

        self.widget.choices = self.choices

        url_params = '&'.join("%s=%s" % param for param in [

            (RelatedFieldWidgetWrapper.TO_FIELD_VAR, self.rel.get_related_field().name),

            (RelatedFieldWidgetWrapper.IS_POPUP_VAR, RelatedFieldWidgetWrapper.IS_POPUP_VALUE),

        ])

        context = {

            'rendered_widget': self.widget.render(name, value, attrs),

            'name': name,

            'url_params': url_params,

            'model': rel_opts.verbose_name,

        }

        change_related_template_url = self.get_related_url(info, 'update', '__fk__')

        context.update(

            change_related_template_url=change_related_template_url,

        )

        add_related_url = self.get_related_url(info, 'create')

        context.update(

            add_related_url=add_related_url,

        )

        delete_related_template_url = self.get_related_url(info, 'delete', '__fk__')

        context.update(

            delete_related_template_url=delete_related_template_url,

        )

        return context

    def value_from_datadict(self, data, files, name):

        return self.widget.value_from_datadict(data, files, name)

    def value_omitted_from_data(self, data, files, name):

        return self.widget.value_omitted_from_data(data, files, name)

    def id_for_label(self, id_):

        return self.widget.id_for_label(id_)

why am i getting such error? The path i have provided in template_name is correct but still says does not exist. Can anyone help me at this, please?