openproject/app/views/common/_validation_error.html.erb

<%#-- copyright
OpenProject is an open source project management software.
Copyright (C) 2012-2020 the OpenProject GmbH

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License version 3.

OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
Copyright (C) 2006-2017 Jean-Philippe Lang
Copyright (C) 2010-2013 the ChiliProject Team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

See docs/COPYRIGHT.rdoc for more details.

++#%>

<% error_message = t("activerecord.errors.template.header.#{(error_messages.count == 1) ? 'one' : 'other'}",
                     count: error_messages.count,
                     model: object_name)
%>

<% single_content_for :error_details do %>
  <p><%= t("errors.header_invalid_fields") %></p>
  <ul>
    <% error_messages.each do |message| %>
      <li><%= message %></li>
    <% end %>
  </ul>
<% end %>

<%= render partial: "common/error_base", locals: { error_message: error_message, classes: classes } %>