When using to generate a sitemap, I encountered a error when running the command. What is the cause of this error and how can I resolve it?django-static-sitemapsTypeError: ‘type’ object is not iterablepython manage.py refresh_sitemap

**views.py**


from django.contrib import sitemaps
from . import models


class WebSitemaps(sitemaps.Sitemap):
    changefreq = "weekly"
    priority = 0.5

    def items(self):
        return models.ArticleModel.objects.all()

    def location(self, obj):
  return f"/{obj.aid}.html"


**settings.py**

STATICSITEMAPS_ROOT_SITEMAP = 'index.sitemaps.WebSitemaps'```
**urls.py**


urlpatterns = [

    re_path('^sitemap-baidu/', include('static_sitemaps.urls')),

] 

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