启动瘦服务器而不使用薄的gem是不起作用的。

I am using ruby 1.9.3 and rails 3.2.2. Every time i use the thin server with private_pub gem it does not work i did rackup private_pub.ru -s thin -E production. I get the following errorI am using ruby 1.9.3 and rails 3.2.2. Every ti