ActionView::Template::Error (incompatible character encodings: UTF-8 and ASCII-8BIT): 46: <% @trackers.each do |tracker| %> 47:  48: <%= check_box_tag 'project[tracker_ids][]', tracker.id, @project.trackers.include?(tracker), :id => nil %> 49: <%=h tracker %> 50:  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