导轨服务器不启动任何服务器

我是一个完整的Ruby on Rails新手继railstutorial.org 我刚安装了rails 3.2.13，创建了一个项目rails new。导轨服务器不启动任何服务器

但是使用命令我不能启动服务器：

rails server

它返回下面的rails命令的帮助信息（而不是使用WEBrick信息），它完全不提server命令。那我该如何启动服务器？由于

Usage: 
rails new APP_PATH [options] 
Options: 
-r, [--ruby=PATH]    # Path to the Ruby binary of your choice 
          # Default: /Users/nathanzylbersztejn/.rvm/rubies/ruby-2.0.0-p0/bin/ruby 
-b, [--builder=BUILDER]  # Path to a application builder (can be a filesystem path or URL) 
-m, [--template=TEMPLATE]  # Path to an application template (can be a filesystem path or URL) 
    [--skip-gemfile]   # Don't create a Gemfile 
    [--skip-bundle]   # Don't run bundle install 
-G, [--skip-git]    # Skip Git ignores and keeps 
-O, [--skip-active-record]  # Skip Active Record files 
-S, [--skip-sprockets]   # Skip Sprockets files 
-d, [--database=DATABASE]  # Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite3/frontbase/ibm_db/sqlserver/jdbcmysql/jdbcsqlite3/jdbcpostgresql/jdbc) 
          # Default: sqlite3 
-j, [--javascript=JAVASCRIPT] # Preconfigure for selected JavaScript library 
          # Default: jquery 
-J, [--skip-javascript]  # Skip JavaScript files 
    [--dev]     # Setup the application with Gemfile pointing to your Rails checkout 
    [--edge]     # Setup the application with Gemfile pointing to Rails repository 
-T, [--skip-test-unit]   # Skip Test::Unit files 
    [--old-style-hash]   # Force using old style hash (:foo => 'bar') on Ruby >= 1.9 

Runtime options: 
-f, [--force] # Overwrite files that already exist 
-p, [--pretend] # Run but do not make any changes 
-q, [--quiet] # Suppress status output 
-s, [--skip]  # Skip files that already exist 

Rails options: 
-h, [--help]  # Show this help message and quit 
-v, [--version] # Show Rails version number and quit 

Description: 
    The 'rails new' command creates a new Rails application with a default 
    directory structure and configuration at the path you specify. 

    You can specify extra command-line arguments to be used every time 
    'rails new' runs in the .railsrc configuration file in your home directory. 

Note that the arguments specified in the .railsrc file don't affect the 
defaults values shown above in this help message.

来源

2013-04-03 znat