undefined method `attribute'

[rainchendan]

NoMethodError - undefined method `attribute' for #<StateInfo:0x007f8666c5e420>:
  activemodel (3.2.13) lib/active_model/attribute_methods.rb:407:in `method_missing'
  activemodel (3.2.13) lib/active_model/attribute_methods.rb:416:in `attribute_missing'
  activemodel (3.2.13) lib/active_model/attribute_methods.rb:407:in `method_missing'

[rainchendan]

Upgrade 1.7.2 to 1.8.0

[rainchendan]

class StateInfo < ParseResource::Base
belongs_to :play_info
belongs_to :user

fields :play, :user, :team, :version, :count, :comment
end

[cpjolicoeur]

Can you please link to a gist with the full stack trace.