I'm getting 404 error on settings page

[mastahfr]

Started GET "/settings/plugin/redmine_rubycas" for xx.xx.xx.xx at 2013-04-28 06:15:23 +0200
Processing by SettingsController#plugin as HTML
Parameters: {"id"=>"redmine_rubycas"}
Current user: admin (id=1)
Rendered settings/plugin.html.erb within layouts/admin (1.1ms)
Missing template, responding with 404
Rendered common/error.html.erb within layouts/base (0.1ms)
Completed 404 Not Found in 11ms (Views: 6.3ms | ActiveRecord: 0.7ms)

Environment:
Redmine version 2.3.0.stable
Ruby version 1.9.3 (x86_64-linux)
Rails version 3.2.13
Environment production
Database adapter Mysql2
Redmine plugins:
redmine_rubycas 0.0.6

[chandrap08]

Same here.. getting a 404 on settings/plugin/redmine_rubycas.