Rails Admin: ActionView::Template::Error (Undefined mixin 'tab-focus'

Rails Admin: ActionView::Template::Error (Undefined mixin 'tab-focus'

I have integrated rails admin. Running it in production mode I am getting
foloowing error
ActionView::Template::Error (Undefined mixin 'tab-focus'.
(in
/home/xyz/.rvm/gems/ruby-2.0.0-p247/gems/rails_admin-0.4.9/app/assets/stylesheets/rails_admin/rails_admin.scss.erb)):
4: %meta{:content => "text/html; charset=utf-8", "http-equiv" =>
"Content-Type"}
5: %meta{:content => "NONE,NOARCHIVE", :name => "robots"}
6: = csrf_meta_tag
7: = stylesheet_link_tag "rails_admin/rails_admin.css", :media =>
:all
8: = javascript_include_tag "rails_admin/rails_admin.js"
9: %body.rails_admin
10: #loading.label.label-warning{:style => 'display:none;
position:fixed; right:20px; bottom:20px; z-index:100000'}=
t('admin.loading')
bootstrap-sass (2.2.1.1)
vendor/assets/stylesheets/bootstrap/_reset.scss:51:in `tab-focus'
bootstrap-sass (2.2.1.1) vendor/assets/stylesheets/bootstrap/_reset.scss:51
rails_admin (0.4.9)
app/assets/stylesheets/rails_admin/rails_admin.scss.erb:20
sass (3.2.10) lib/sass/tree/visitors/perform.rb:253:in `visit_mixin'
sass (3.2.10) lib/sass/tree/visitors/base.rb:37:in `visit'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:100:in `visit'
sass (3.2.10) lib/sass/tree/visitors/base.rb:53:in `block in
visit_children'
sass (3.2.10) lib/sass/tree/visitors/base.rb:53:in `map'
sass (3.2.10) lib/sass/tree/visitors/base.rb:53:in `visit_children'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:109:in `block in
visit_children'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:121:in `with_environment'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:108:in `visit_children'
sass (3.2.10) lib/sass/tree/visitors/base.rb:37:in `block in visit'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:320:in `visit_rule'
sass (3.2.10) lib/sass/tree/visitors/base.rb:37:in `visit'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:100:in `visit'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:227:in `block in
visit_import'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:227:in `map'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:227:in `visit_import'
sass (3.2.10) lib/sass/tree/visitors/base.rb:37:in `visit'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:100:in `visit'
sass (3.2.10) lib/sass/tree/visitors/base.rb:53:in `block in
visit_children'
sass (3.2.10) lib/sass/tree/visitors/base.rb:53:in `map'
sass (3.2.10) lib/sass/tree/visitors/base.rb:53:in `visit_children'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:109:in `block in
visit_children'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:121:in `with_environment'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:108:in `visit_children'
sass (3.2.10) lib/sass/tree/visitors/base.rb:37:in `block in visit'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:128:in `visit_root'
sass (3.2.10) lib/sass/tree/visitors/base.rb:37:in `visit'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:100:in `visit'
sass (3.2.10) lib/sass/tree/visitors/perform.rb:7:in `visit'
sass (3.2.10) lib/sass/tree/root_node.rb:20:in `render'
sass (3.2.10) lib/sass/engine.rb:315:in `_render'
sass (3.2.10) lib/sass/engine.rb:262:in `render'
sass-rails (3.2.6) lib/sass/rails/template_handlers.rb:106:in `evaluate'
tilt (1.4.1) lib/tilt/template.rb:103:in `render'
sprockets (2.2.2) lib/sprockets/context.rb:193:in `block in evaluate'
sprockets (2.2.2) lib/sprockets/context.rb:190:in `each'
sprockets (2.2.2) lib/sprockets/context.rb:190:in `evaluate'
sprockets (2.2.2) lib/sprockets/processed_asset.rb:12:in `initialize'
sprockets (2.2.2) lib/sprockets/base.rb:249:in `new'
sprockets (2.2.2) lib/sprockets/base.rb:249:in `block in build_asset'
sprockets (2.2.2) lib/sprockets/base.rb:270:in `circular_call_protection'
sprockets (2.2.2) lib/sprockets/base.rb:248:in `build_asset'
sprockets (2.2.2) lib/sprockets/index.rb:93:in `block in build_asset'
sprockets (2.2.2) lib/sprockets/caching.rb:19:in `cache_asset'
sprockets (2.2.2) lib/sprockets/index.rb:92:in `build_asset'
sprockets (2.2.2) lib/sprockets/base.rb:169:in `find_asset'
sprockets (2.2.2) lib/sprockets/index.rb:60:in `find_asset'
sprockets (2.2.2) lib/sprockets/bundled_asset.rb:16:in `initialize'
sprockets (2.2.2) lib/sprockets/base.rb:252:in `new'
sprockets (2.2.2) lib/sprockets/base.rb:252:in `build_asset'
sprockets (2.2.2) lib/sprockets/index.rb:93:in `block in build_asset'
sprockets (2.2.2) lib/sprockets/caching.rb:19:in `cache_asset'
sprockets (2.2.2) lib/sprockets/index.rb:92:in `build_asset'
sprockets (2.2.2) lib/sprockets/base.rb:169:in `find_asset'
sprockets (2.2.2) lib/sprockets/index.rb:60:in `find_asset'
sprockets (2.2.2) lib/sprockets/base.rb:177:in `[]'
actionpack (3.2.12) lib/sprockets/helpers/rails_helper.rb:137:in
`digest_for'
actionpack (3.2.12) lib/sprockets/helpers/rails_helper.rb:151:in
`rewrite_asset_path'
actionpack (3.2.12) lib/action_view/asset_paths.rb:27:in
`compute_public_path'
actionpack (3.2.12) lib/sprockets/helpers/rails_helper.rb:56:in
`asset_path'
actionpack (3.2.12) lib/sprockets/helpers/rails_helper.rb:49:in `block
in stylesheet_link_tag'
actionpack (3.2.12) lib/sprockets/helpers/rails_helper.rb:43:in `collect'
actionpack (3.2.12) lib/sprockets/helpers/rails_helper.rb:43:in
`stylesheet_link_tag'
rails_admin (0.4.9)
app/views/layouts/rails_admin/application.html.haml:7:in
`__home_proptiger___rvm_gems_ruby_______p____gems_rails_admin_______app_views_layouts_rails_admin_application_html_haml___79710182046519270_56820600'
actionpack (3.2.12) lib/action_view/template.rb:145:in `block in render'
activesupport (3.2.12) lib/active_support/notifications.rb:125:in
`instrument'
actionpack (3.2.12) lib/action_view/template.rb:143:in `render'
actionpack (3.2.12) lib/action_view/renderer/template_renderer.rb:59:in
`render_with_layout'
actionpack (3.2.12) lib/action_view/renderer/template_renderer.rb:45:in
`render_template'
actionpack (3.2.12) lib/action_view/renderer/template_renderer.rb:18:in
`render'
actionpack (3.2.12) lib/action_view/renderer/renderer.rb:36:in
`render_template'
actionpack (3.2.12) lib/action_view/renderer/renderer.rb:17:in `render'
actionpack (3.2.12) lib/abstract_controller/rendering.rb:110:in
`_render_template'
actionpack (3.2.12) lib/action_controller/metal/streaming.rb:225:in
`_render_template'
actionpack (3.2.12) lib/abstract_controller/rendering.rb:103:in
`render_to_body'
actionpack (3.2.12) lib/action_controller/metal/renderers.rb:28:in
`render_to_body'
actionpack (3.2.12) lib/action_controller/metal/compatibility.rb:50:in
`render_to_body'
actionpack (3.2.12) lib/abstract_controller/rendering.rb:88:in `render'
actionpack (3.2.12) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:40:in
`block (2 levels) in render'
activesupport (3.2.12) lib/active_support/core_ext/benchmark.rb:5:in
`block in ms'
/home/xyz/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/benchmark.rb:296:in
`realtime'
activesupport (3.2.12) lib/active_support/core_ext/benchmark.rb:5:in `ms'
actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:40:in
`block in render'
actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:83:in
`cleanup_view_runtime'
activerecord (3.2.12)
lib/active_record/railties/controller_runtime.rb:24:in
`cleanup_view_runtime'
sunspot_rails (2.0.0)
lib/sunspot/rails/railties/controller_runtime.rb:15:in
`cleanup_view_runtime'
actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:39:in
`render'
remotipart (1.2.1) lib/remotipart/render_overrides.rb:14:in
`render_with_remotipart'
rails_admin (0.4.9) lib/rails_admin/config/actions/dashboard.rb:34:in
`block (2 levels) in <class:Dashboard>'
(eval):8:in `instance_eval'
(eval):8:in `dashboard'
actionpack (3.2.12) lib/action_controller/metal/implicit_render.rb:4:in
`send_action'
actionpack (3.2.12) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.12) lib/action_controller/metal/rendering.rb:10:in
`process_action'
actionpack (3.2.12) lib/abstract_controller/callbacks.rb:18:in `block in
process_action'
activesupport (3.2.12) lib/active_support/callbacks.rb:458:in
`_run__3515959959837999765__process_action__1610680813001794184__callbacks'
activesupport (3.2.12) lib/active_support/callbacks.rb:405:in
`__run_callback'
activesupport (3.2.12) lib/active_support/callbacks.rb:385:in
`_run_process_action_callbacks'
activesupport (3.2.12) lib/active_support/callbacks.rb:81:in
`run_callbacks'
actionpack (3.2.12) lib/abstract_controller/callbacks.rb:17:in
`process_action'
actionpack (3.2.12) lib/action_controller/metal/rescue.rb:29:in
`process_action'
actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:30:in
`block in process_action'
activesupport (3.2.12) lib/active_support/notifications.rb:123:in `block
in instrument'
activesupport (3.2.12)
lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.12) lib/active_support/notifications.rb:123:in
`instrument'
actionpack (3.2.12) lib/action_controller/metal/instrumentation.rb:29:in
`process_action'
actionpack (3.2.12) lib/action_controller/metal/params_wrapper.rb:207:in
`process_action'
activerecord (3.2.12)
lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.2.12) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.12) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.12) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.12) lib/action_controller/metal/rack_delegation.rb:14:in
`dispatch'
actionpack (3.2.12) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.12) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.12) lib/action_dispatch/routing/route_set.rb:73:in
`dispatch'
actionpack (3.2.12) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.12) lib/action_dispatch/routing/route_set.rb:601:in `call'
railties (3.2.12) lib/rails/engine.rb:479:in `call'
railties (3.2.12) lib/rails/railtie/configurable.rb:30:in `method_missing'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.12) lib/action_dispatch/routing/route_set.rb:601:in `call'
rack-pjax (0.7.0) lib/rack/pjax.rb:12:in `call'
omniauth (1.1.4) lib/omniauth/strategy.rb:184:in `call!'
omniauth (1.1.4) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.1.4) lib/omniauth/strategy.rb:184:in `call!'
omniauth (1.1.4) lib/omniauth/strategy.rb:164:in `call'
warden (1.2.1) lib/warden/manager.rb:35:in `block in call'
warden (1.2.1) lib/warden/manager.rb:34:in `catch'
warden (1.2.1) lib/warden/manager.rb:34:in `call'
actionpack (3.2.12)
lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.5) lib/rack/etag.rb:23:in `call'
rack (1.4.5) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.12) lib/action_dispatch/middleware/head.rb:14:in `call'
remotipart (1.2.1) lib/remotipart/middleware.rb:27:in `call'
actionpack (3.2.12)
lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.12) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context'
rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call'
actionpack (3.2.12) lib/action_dispatch/middleware/cookies.rb:341:in `call'
activerecord (3.2.12) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.12)
lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in
`call'
actionpack (3.2.12) lib/action_dispatch/middleware/callbacks.rb:28:in
`block in call'
activesupport (3.2.12) lib/active_support/callbacks.rb:405:in
`_run__2632703254614144387__call__2141170115215613932__callbacks'
activesupport (3.2.12) lib/active_support/callbacks.rb:405:in
`__run_callback'
activesupport (3.2.12) lib/active_support/callbacks.rb:385:in
`_run_call_callbacks'
activesupport (3.2.12) lib/active_support/callbacks.rb:81:in
`run_callbacks'
actionpack (3.2.12) lib/action_dispatch/middleware/callbacks.rb:27:in
`call'
actionpack (3.2.12) lib/action_dispatch/middleware/remote_ip.rb:31:in
`call'
actionpack (3.2.12)
lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.12)
lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.12) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.12) lib/rails/rack/logger.rb:16:in `block in call'
activesupport (3.2.12) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.12) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.12) lib/action_dispatch/middleware/request_id.rb:22:in
`call'
rack (1.4.5) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.5) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.12)
lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.5) lib/rack/lock.rb:15:in `call'
rack-cache (1.2) lib/rack/cache/context.rb:136:in `forward'
rack-cache (1.2) lib/rack/cache/context.rb:245:in `fetch'
rack-cache (1.2) lib/rack/cache/context.rb:185:in `lookup'
rack-cache (1.2) lib/rack/cache/context.rb:66:in `call!'
rack-cache (1.2) lib/rack/cache/context.rb:51:in `call'
railties (3.2.12) lib/rails/engine.rb:479:in `call'
railties (3.2.12) lib/rails/application.rb:223:in `call'
rack (1.4.5) lib/rack/content_length.rb:14:in `call'
railties (3.2.12) lib/rails/rack/log_tailer.rb:17:in `call'
rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service'
/home/xyz/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:138:in
`service'
/home/xyz/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:94:in
`run'
/home/xyz/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/server.rb:295:in
`block in start_thread'
I have searched at many places, but not got any relevant answer. Please
let me know fix for this.
Thanks