Point to a specific version of guide to make the redirect work

activejob/lib/active_job/queue_adapters/inline_adapter.rb

@@ -15,7 +15,7 @@ def enqueue(job) #:nodoc:
         end
 
         def enqueue_at(*) #:nodoc:
-          raise NotImplementedError.new("Use a queueing backend to enqueue jobs in the future. Read more at http://guides.rubyonrails.org/active_job_basics.html")
+          raise NotImplementedError.new("Use a queueing backend to enqueue jobs in the future. Read more at http://guides.rubyonrails.org/v4.2.0/active_job_basics.html")
         end
       end
     end