通过unicorn master -E production -c config/unicorn.rb -D 启动 unicorn 的时候 遇到下面得错误

/usr/home/vps1/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/unicorn-4.8.3/lib/unicorn/configurator.rb:659:in `parse_rackup_file': rackup file (master) not readable (ArgumentError)
    from /usr/home/vps1/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/unicorn-4.8.3/lib/unicorn/configurator.rb:77:in `reload'
    from /usr/home/vps1/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/unicorn-4.8.3/lib/unicorn/configurator.rb:68:in `initialize'
    from /usr/home/vps1/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/unicorn-4.8.3/lib/unicorn/http_server.rb:100:in `new'
    from /usr/home/vps1/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/unicorn-4.8.3/lib/unicorn/http_server.rb:100:in `initialize'
    from /usr/home/vps1/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/unicorn-4.8.3/bin/unicorn:126:in `new'
    from /usr/home/vps1/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/unicorn-4.8.3/bin/unicorn:126:in `<top (required)>'
    from /usr/home/vps1/.rbenv/versions/2.1.5/bin/unicorn:23:in `load'
    from /usr/home/vps1/.rbenv/versions/2.1.5/bin/unicorn:23:in `<main>'

部署方式 选择的是 nginx + unicorn 之前运转一直良好，直到被我 kill 掉以后就一直启不来，unicorn 的配置方式也是参考的 railscasts 上的，具体配置

working_directory "/usr/home/vps1/appname"
pid "/usr/home/vps1/appname/tmp/pids/unicorn.pid"
stderr_path "/usr/home/vps1/appname/log/unicorn.error.log"
stdout_path "/usr/home/vps1/appname/log/unicorn.log"

listen "/tmp/unicorn.appname.sock"
worker_processes 2
timeout 30

各位有谁遇到过类似部署问题，求线索啊~

补充

找到原因了，命令格式错了，应该是 unicorn -E production -c config/unicorn.rb -D ，删掉前面出现得master即可。我是直接从ps aux | grep unicorn的输出中粘过来的 ⊙﹏⊙b 汗，这里贴一下，希望帮到遇到同样错误的人