[Rails] Unicorn deployment error

I have a simple rails3 application. Trying to deploy this app using unicorn-4.4.0, I am getting the following error.

unicorn -c config/unicorn/development.rb -D -d

{:unicorn_options=>

  {:listeners=>[], :config_file=>"config/unicorn/development.rb"},

 :app=>

  #<Proc:0x1d42574@/home/sample/rails_app/shared/bundle/ruby/1.9.1/gems/unicorn-4.4.0/lib/unicorn.rb:39 (lambda)>,

 :daemonize=>true}

Exception `EOFError' at /home/sample/rails_app/shared/bundle/ruby/1.9.1/gems/unicorn-4.4.0/lib/unicorn/launcher.rb:46 - end of file reached

master failed to start, check stderr log for details

why this err happend? How to resolve this?

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