Error 403 on new project with Mezzanine 5.1.3 and Django 4.0.3

[BOFH2k]

While the admin interface runs fine, the start page (index.html) cannot be found for some reason. What is going wrong here (templates and static were collected, settings.py and urls.py as on github master)?

path("", TemplateView.as_view(template_name="index.html"), name="home"),

Page not found (404)

Request Method: GET
https://url.replaced/403.shtml/
mezzanine.pages.views.page

  <p>
  Using the URLconf defined in <code>blog.urls</code>,
  Django tried these URL patterns, in this order:
  </p>
  <ol>
    
      <li>
        
            admin/
            
        
      </li>
    
      <li>
        
            
            [name='home']
        
      </li>
    
      <li>
        
            
            
        
            ^jsi18n/(?P&lt;packages&gt;\S+?)/$
            
        
      </li>
    
      <li>
        
            
            
        
            sitemap.xml
            
        
      </li>
    
      <li>
        
            
            
        
            robots.txt
            
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            password_reset/
            [name='password_reset']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            password_reset/done/
            [name='password_reset_done']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            reset/done/
            [name='password_reset_complete']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            reset/&lt;uidb64&gt;/&lt;token&gt;/
            [name='password_reset_confirm']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            edit/
            [name='edit']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            search/
            [name='search']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            set_site/
            [name='set_site']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            rating/
            [name='rating']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            comment/
            [name='comment']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            ^accounts/login/$
            [name='login']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            ^accounts/logout/$
            [name='logout']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            ^accounts/signup/$
            [name='signup']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            ^accounts/verify/(?P&lt;uidb36&gt;[-\w]+)/(?P&lt;token&gt;[-\w]+)/$
            [name='signup_verify']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            ^accounts/update/$
            [name='profile_update']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            ^accounts/password/reset/$
            [name='mezzanine_password_reset']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            ^accounts/password/verify/(?P&lt;uidb36&gt;[-\w]+)/(?P&lt;token&gt;[-\w]+)/$
            [name='password_reset_verify']
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            ^accounts/$
            [name='account_redirect']
        
      </li>
    
      <li>
        
            
            
        
            blog/
            
        
      </li>
    
      <li>
        
            
            
        
            
            
        
            &lt;path:slug&gt;/
            [name='page']
        
      </li>
    
  </ol>
  <p>
    
      The current path, <code>403.shtml/</code>,
    
    matched the last one.
  </p>

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.