When using field group on a drupal 8 website one can create a field group in the user configuration page.
However, after adding the group (group+technical name) the form to adapte the user configuration becomes inusable.
When looking in the logging following error line can be found:
mod_fcgid: stderr: Uncaught PHP Exception Symfony\\Component\\Routing\\Exception\\RouteNotFoundException: "Route "field_ui.field_group_delete_user" does not exist." at /home/****/public_html/core/lib/Drupal/Core/Routing/RouteProvider.php line 191