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localhost:3000我在 rails 服务器(

Error starting application 
Your Rack app raised an exception when Pow tried to run it. 
LoadError: cannot load such file -- rack/jsonp 
~/.rvm/rubies/ruby-1.9.3-p327/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require' 
~/.rvm/rubies/ruby-1.9.3-p327/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require' 
~/config.ru:2:in `block in ' 
~/Library/Application Support/Pow/Versions/0.4.1/node_modules/nack/lib/nack/builder.rb:4:in `instance_eval' 
~/Library/Application Support/Pow/Versions/0.4.1/node_modules/nack/lib/nack/builder.rb:4:in `initialize'

有任何想法吗?

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