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.