I am trying to render a Multi-Url-Picker using the standard Umbraco documentation at: https://our.umbraco.com/Documentation/Getting-Started/Backoffice/Property-Editors/Built-in-Property-Editors/Multi-Url-Picker/index-vpre8_8

The datatype "secondaryNav" is placed on a "SiteSettings" page node in the content tree where i have my settings.

Unfortunately i keep getting this error message. Since i am using code taken directly from the documentation it must be something about my "siteSettings"-setup that causes the problem but i cannot see what.

My code:

@{
    var siteSettings = root.SiblingsAndSelf().Where(x => x.ContentType.Alias == "siteSettings").First();
    var links = siteSettings.Value<IEnumerable<Link>>("secondaryNav");
     if (links.Any())
     {
         foreach (var link in links)
         {
             <li><a href="@link.Url()" target="@link.Target">@link.Name</a></li>
         }
     }
 }