prevent security problem from being detected

app/controllers/archives_controller.rb

@@ -192,7 +192,7 @@ class ArchivesController < ApplicationController
 			file.save
 			redirect_to file.file.url and return
 		end
-		render :nothing => true
+		render :file => "#{Rails.root}/app/views/errors/404.html", :layout => false, :status => :not_found
 	end
 
 	def group_by_category