在Gemfile中包含"gem'active_merchant_payu_in'".捆绑安装时出现此错误
/home/waheguru/.rvm/gems/ruby-2.2.0/gems/active_merchant_payu_in-0.0.1/lib/active_merchant_payu_in.rb:2:in `require': cannot load such file -- active_merchant/billing/integrations (LoadError)