rails error when db:migration add_rpx_to_admins after adding gem devise_rpx_connectable

Question

The error : /Users/bo/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in require': cannot load such file -- devise/schema (LoadError) from /Users/bo/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:inblock in require' from /Users/bo/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:236:in load_dependency' from /Users/bo/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:inrequire' from /Users/bo/.rvm/gems/ruby-1.9.3-p194/gems/devise_rpx_connectable-0.2.2/lib/devise_rpx_connectable/schema.rb:2:in <top (required)>' from /Users/bo/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:inrequire' from /Users/bo/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in block in require' from /Users/bo/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:236:inload_dependency' from /Users/bo/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in require' from /Users/bo/.rvm/gems/ruby-1.9.3-p194/gems/devise_rpx_connectable-0.2.2/lib/devise_rpx_connectable.rb:13:in' from /Users/bo/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.3/lib/bundler/runtime.rb:68:in require' from /Users/bo/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.3/lib/bundler/runtime.rb:68:inblock (2 levels) in require' from /Users/bo/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.3/lib/bundler/runtime.rb:66:in each' from /Users/bo/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.3/lib/bundler/runtime.rb:66:inblock in require' from /Users/bo/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.3/lib/bundler/runtime.rb:55:in each' from /Users/bo/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.3/lib/bundler/runtime.rb:55:inrequire' from /Users/bo/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.3/lib/bundler.rb:119:in require' from /Users/bo/Rails/blog/config/application.rb:7:in' from script/rails:6:in require' from script/rails:6:in'

============================ My gems : Gems included by the bundle: * actionmailer (3.2.3) * actionpack (3.2.3) * activemodel (3.2.3) * activerecord (3.2.3) * activeresource (3.2.3) * activesupport (3.2.3) * arel (3.0.2) * bcrypt-ruby (3.0.1) * builder (3.0.0) * bundler (1.1.3) * coffee-rails (3.2.2) * coffee-script (2.2.0) * coffee-script-source (1.3.3) * copycopter_client (2.0.0) * devise (2.1.0) * devise_rpx_connectable (0.2.2) * erubis (2.7.0) * execjs (1.3.2) * hike (1.2.1) * i18n (0.6.0) * journey (1.0.3) * jquery-datatables-rails (1.9.1.3 9e88f3c) * jquery-rails (2.0.2) * jquery-ui-rails (0.4.0) * json (1.7.3) * json_pure (1.7.3) * mail (2.4.4) * mime-types (1.18) * multi_json (1.3.5) * orm_adapter (0.0.7) * polyglot (0.3.3) * rack (1.4.1) * rack-cache (1.2) * rack-ssl (1.3.2) * rack-test (0.6.1) * rails (3.2.3) * railties (3.2.3) * rake (0.9.2.2) * rdoc (3.12) * rpx_now (0.6.24) * sass (3.1.18) * sass-rails (3.2.5) * sprockets (2.1.3) * sqlite3 (1.3.6) * thor (0.14.6) * tilt (1.3.3) * treetop (1.4.10) * tzinfo (0.3.33) * uglifier (1.2.4) * warden (1.1.1)

Thank you!