Problem in using RailsProductGenerator

i am having problem in generate shopping cart

if i use all instructions
regarding rails_product

ruby script/generate site my_first_cart

./script/…/config/…/lib/productize.rb:1: warning: already
initialized constant SITE
active_support/dependencies.rb:477:in const_missing': uninitialized constant ActionController::Routing::RouteSet::NamedRoutes (NameError) from ./script/../config/../lib/productize.rb:85:inreload’
from ./script/…/config/environment.rb:91
from script/generate:2

Please help

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