rake db:seed error

loading ruby /app/vendor/bundle/ruby/2.0.0/gems/spree_core-2.4.5/db/default/spree/countries.rb
loading ruby /app/vendor/bundle/ruby/2.0.0/gems/spree_core-2.4.5/db/default/spree/roles.rb
loading ruby /app/vendor/bundle/ruby/2.0.0/gems/spree_core-2.4.5/db/default/spree/states.rb
rake aborted!
NoMethodError: undefined method `subregions?' for nil:NilClass
/app/vendor/bundle/ruby/2.0.0/gems/spree_core-2.4.5/db/default/spree/states.rb:5:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/relation/delegation.rb:46:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/relation/delegation.rb:46:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/spree_core-2.4.5/db/default/spree/states.rb:2:in `block in <top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `block in transaction'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/database_statements.rb:209:in `within_new_transaction'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `transaction'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/transactions.rb:208:in `transaction'
/app/vendor/bundle/ruby/2.0.0/gems/spree_core-2.4.5/db/default/spree/states.rb:1:in `<top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
/app/vendor/bundle/ruby/2.0.0/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:247:in `block in require'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:232:in `load_dependency'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:247:in `require'
/app/vendor/bundle/ruby/2.0.0/gems/spree_core-2.4.5/lib/tasks/core.rake:11:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/spree_core-2.4.5/lib/tasks/core.rake:30:in `block (3 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/spree_core-2.4.5/lib/tasks/core.rake:24:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/spree_core-2.4.5/lib/tasks/core.rake:24:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/spree_core-2.4.5/db/seeds.rb:5:in `<top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:241:in `load'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:241:in `block in load'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:232:in `load_dependency'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:241:in `load'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.1.8/lib/rails/engine.rb:543:in `load_seed'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.1.8/lib/rails/railtie.rb:194:in `public_send'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.1.8/lib/rails/railtie.rb:194:in `method_missing'
/app/db/seeds.rb:10:in `<top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:241:in `load'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:241:in `block in load'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:232:in `load_dependency'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.8/lib/active_support/dependencies.rb:241:in `load'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.1.8/lib/rails/engine.rb:543:in `load_seed'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:200:in `load_seed'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.1.8/lib/active_record/railties/databases.rake:174:in `block (2 levels) in <top (required)>'