Issue what I have found when integrating with Solidus bundle exec rake db:migrate
WARN DurableDecorator: Spree::Shipment#after_ship decoration uses an invalid SHA. The original method definition could have been tampered with! WARN DurableDecorator: Expected SHA was 5401c76850xxxxxxxxxxxxxxxxxxxxx but the provided SHA is e8eca7f8a50ad8xxxxxxxxxxxxxxxxxxxxxxxx
when working with Spree 3.0.4 NoMethodError in Spree::Admin::Shipments#index, as discussed spree-contrib#73