ActionView::Template::Error (incompatible character encodings: UTF-8 and ASCII-8BIT):
46: <% @trackers.each do |tracker| %>
47:     <label class="floating">
48:     <%= check_box_tag 'project[tracker_ids][]', tracker.id, @project.trackers.include?(tracker), :id => nil %>
49:     <%=h tracker %>
50:     </label>
51: <% end %>
52: <%= hidden_field_tag 'project[tracker_ids][]', '' %>
app/views/projects/_form.html.erb:49:in `block in _app_views_projects__form_html_erb__1067199467417197613_32603140'

redmin 出现的 这个错误