Redmine

You can work around it by creating the file config/routes.rb (inside the plugin folder), with the contents following that pattern:

ActionController::Routing::Routes.draw do |map|
  map.connect '/controller_name/action_name', :controller => 'controller_name', :action => 'action_name'
end

Replace the controller_name and action_name by the ones you are getting on your error log. Create one line like that for each route that you get an error.