Error when I try to load the cart on spree 2.1.

gistfile1.txt

Spree::Product::Translation Load (0.1ms)  SELECT "spree_product_translations".* FROM "spree_product_translations" WHERE "spree_product_translations"."spree_product_id" = ?  [["spree_product_id", 19]]
  Rendered spree/orders/_line_item.html.erb (18.8ms)
  Rendered spree/orders/_form.html.erb (78.5ms)
  Rendered spree/orders/edit.html.erb within spree/layouts/spree_application (102.2ms)
Completed 500 Internal Server Error in 246ms

NoMethodError - undefined method `name' for #<Spree::LineItem:0x00000007f8b810>:
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  activerecord (4.0.0) lib/active_record/attribute_methods.rb:131:in `method_missing'
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  actionpack (4.0.0) lib/action_view/helpers/capture_helper.rb:38:in `block in capture'
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  actionpack (4.0.0) lib/action_view/helpers/capture_helper.rb:38:in `capture'
  haml (4.0.3) lib/haml/helpers/action_view_mods.rb:59:in `capture_with_haml'
  actionpack (4.0.0) lib/action_view/helpers/form_helper.rb:1864:in `block in fields_for_nested_model'
  actionpack (4.0.0) lib/action_view/helpers/capture_helper.rb:38:in `block in capture'
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  app/views/spree/orders/_line_item.html.erb:2:in `_af225cf8105137e3320093da7dfdc707'
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  haml (4.0.3) lib/haml/helpers/action_view_mods.rb:12:in `render_with_haml'
  app/views/spree/orders/_form.html.erb:3:in `_d99d162e43b9e2e5e0aab2c0174cfdf3'
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  app/views/spree/orders/edit.html.erb:15:in `block in _c6e6368d1f4b04f0560e04dbf882330d'
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  haml (4.0.3) lib/haml/helpers/action_view_mods.rb:59:in `capture_with_haml'
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  haml (4.0.3) lib/haml/helpers/action_view_xss_mods.rb:28:in `form_for_with_haml_xss'
  app/views/spree/orders/edit.html.erb:13:in `_c6e6368d1f4b04f0560e04dbf882330d'
  actionpack (4.0.0) lib/action_view/template.rb:143:in `block in render'
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