Redmine

Hi,

I have installed redmine(2.4.2) on ubuntu12.04. I'm able to login but when I try to access settings page getting

"Internal error

An error occurred on the page you were trying to access.
If you continue to experience problems please contact your Redmine administrator for assistance.

If you are the Redmine administrator, check your log files for details about the error.

Back"

here is log details

ActionView::Template::Error (uninitialized constant Redmine::Scm::Adapters::AbstractAdapter::CommandFailed):
10: <th><%= l(:text_scm_command_version) ></th>
11: </tr>
12: < Redmine::Scm::Base.all.collect do |choice| >
13: < scm_class = "Repository::#{choice}".constantize >
14: < text, value = (choice.is_a?(Array) ? choice : [choice, choice]) >
15: < setting = :enabled_scm >
16: < enabled = Setting.send(setting).include?(value) %>
lib/redmine/scm/adapters/abstract_adapter.rb:30:in `<class:AbstractAdapter>'
lib/redmine/scm/adapters/abstract_adapter.rb:27:in `<module:Adapters>'
lib/redmine/scm/adapters/abstract_adapter.rb:26:in `<module:Scm>'
lib/redmine/scm/adapters/abstract_adapter.rb:25:in `<module:Redmine>'
lib/redmine/scm/adapters/abstract_adapter.rb:24:in `<top (required)>'
lib/redmine/scm/adapters/subversion_adapter.rb:18:in `<top (required)>'
app/models/repository/subversion.rb:18:in `<top (required)>'
app/views/settings/_repositories.html.erb:13:in `block (2 levels) in app_views_settings_repositories_html_erb___209865324_94295810'
app/views/settings/_repositories.html.erb:12:in `collect'
app/views/settings/_repositories.html.erb:12:in `block in app_views_settings_repositories_html_erb___209865324_94295810'
app/views/settings/_repositories.html.erb:1:in `_app_views_settings__repositories_html_erb___209865324_94295810'
app/views/common/_tabs.html.erb:24:in `block in app_views_common_tabs_html_erb___895036420__641517268'
app/views/common/_tabs.html.erb:23:in `each'
app/views/common/_tabs.html.erb:23:in `_app_views_common__tabs_html_erb___895036420__641517268'
app/helpers/application_helper.rb:272:in `render_tabs'
app/views/settings/edit.html.erb:3:in `_app_views_settings_edit_html_erb___1028967226__644797018'
app/controllers/settings_controller.rb:28:in `index'