> rails s が急にできなくなってしまいました。。。
>
> 表示されたログです。
```

    > bin/rails:6: warning: already initialized constant APP_PATH
    > /Users/Sean/Desktop/Renascence/bin/rails:6: warning: previous
    > definition of APP_PATH was here Usage: rails COMMAND [ARGS]
    > 
    > The most common rails commands are:  generate    Generate new code
    > (short-cut alias: "g")  console     Start the Rails console (short-cut
    > alias: "c")  server      Start the Rails server (short-cut alias: "s")
    > dbconsole   Start a console for the database specified in
    > config/database.yml
    >              (short-cut alias: "db")  new         Create a new Rails application. "rails new my_app" creates a
    >              new application called MyApp in "./my_app"
    > 
    > In addition to those, there are:  application  Generate the Rails
    > application code  destroy      Undo code generated with "generate"
    > (short-cut alias: "d")  plugin new   Generates skeleton for developing
    > a Rails plugin  runner       Run a piece of code in the application
    > environment (short-cut alias: "r")
    > 
    > All commands can be run with -h (or --help) for more information.
    
```
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question
ruby-on-rails ruby rails-activerecord
warning: already initialized constant APP_PATH
エラーの原因は様々あるようです。

<http://tic40.hatenablog.com/entry/2015/02/14/024415>  
<http://xengineer.hatenablog.com/entry/2014/10/30/bin/rails%3A6%3A_warning%3A_already_initialized_constant_APP_PATH>

以下のコマンドを打つと、本当のエラーの原因が表示されるようです。  
まずはここから追ってみてはどうでしょう？

> rake rails:update:bin
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answer