Redmine

i installed the plugin as mention in the http://www.redmine.org/projects/redmine/wiki/Plugins url , but when i access via Administration -> Plugin -> configure

gives the following error , redmine-2.2.2

"The page you were trying to access doesn't exist or has been removed. "

and gives following error in redmine-2.1.2

The page you were trying to access doesn't exist or has been removed. "

and in production.log file

Started GET "/settings/plugin/redmine_ldap_sync" for 10.100.1.56 at Mon Jan 28 12:25:29 +0530 2013
Processing by SettingsController#plugin as HTML
Parameters: {"id"=>"redmine_ldap_sync"}
Current user: admin (id=1)
Rendered settings/plugin.html.erb within layouts/admin (3.8ms)
Missing template, responding with 404
Rendered common/error.html.erb within layouts/base (0.6ms)
Completed 404 Not Found in 38ms (Views: 21.2ms | ActiveRecord: 0.6ms)

Please check..

Thank You
John