undefined local variable or method `try_spree_current_user'

If you create your custom spree controller,

beware that you will need to add in some spree controller helper to make the magic works

include Spree::Core::ControllerHelpers::Auth
include Spree::Core::ControllerHelpers::Store
include Spree::Core::ControllerHelpers::Order

or

you may extends from Spree::BaseController