Page not found (404)

No Categories matches the given query.
Request Method: GET
Request URL: https://rp9.ru/contacts?customize_changeset_uuid=a2b11788-ddb4-43b8-b117-893164b7e193&customize_autosaved=on
Raised by: main.views.show_category

Using the URLconf defined in White_Helmet.urls, Django tried these URL patterns, in this order:

  1. admin/
  2. tinymce/
  3. [name='home']
  4. search/<str:filter_mode>/<str:filter_time> [name='search_results']
  5. <slug:cat_slug>/<slug:post_slug> [name='url_post']
  6. <slug:cat_slug> [name='cat_name']

The current path, contacts, matched the last one.

You’re seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.