Rails 3.2.13运行rails server后出错！提示：Usage:rails new APP_PATH [options] Options:......

    今天从github上clone了一个rails项目下来准备运行它，输入：rails server

    提示：

Usage:  rails new APP_PATH [options]Options:  -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  -G, [--skip-git]               # Skip Git ignores and keeps  -m, [--template=TEMPLATE]      # Path to an application template (can be a filesystem path or URL)  -b, [--builder=BUILDER]        # Path to a application builder (can be a filesystem path or URL)      [--old-style-hash]         # Force using old style hash (:foo => 'bar') on Ruby >= 1.9      [--skip-gemfile]           # Don't create a Gemfile  -d, [--database=DATABASE]      # Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite3/frontbase/ibm_db/jdbcmysql/jdbcsqlite3/jdbcpostgresql/jdbc)                                 # Default: sqlite3  -O, [--skip-active-record]     # Skip Active Record files      [--skip-bundle]            # Don't run bundle install  -T, [--skip-test-unit]         # Skip Test::Unit files  -S, [--skip-sprockets]         # Skip Sprockets files  -r, [--ruby=PATH]              # Path to the Ruby binary of your choice                                 # Default: /home/xichen/.rvm/rubies/ruby-1.8.7-p352/bin/ruby  -j, [--javascript=JAVASCRIPT]  # Preconfigure for selected JavaScript library                                 # Default: jqueryRuntime options:  -q, [--quiet]    # Supress status output  -s, [--skip]     # Skip files that already exist  -f, [--force]    # Overwrite files that already exist  -p, [--pretend]  # Run but do not make any changesRails options:  -h, [--help]     # Show this help message and quit  -v, [--version]  # Show Rails version number and quitDescription:    The 'rails new' command creates a new Rails application with a default    directory structure and configuration at the path you specify.Example:    rails new ~/Code/Ruby/weblog    This generates a skeletal Rails installation in ~/Code/Ruby/weblog.    See the README in the newly created application to get going.

    后来在stackoverflow中找到了原因。由于我电脑上安装的rails版本是3.2.13，而我要运行的项目的rails版本是4.0.0，要解决这个问题，需要把自己的rails版本升级到4.0.0，或者你从你之前用3.2.13版本创建的rails项目下的script文件夹中拷贝里面的rails这个文件到你的4.0.0版本项目的script文件夹中就可以解决了！

    但是，可能会提示：

    Could not find i18n-0.6.4 in any of the sources

    Run `bundle install` to install missing gems.

    这类的问题，只要运行一下bundle install就可以了！

 

    rails项目的服务器成功运行后，进入项目主页时，又出现如下错误：

   

    这主要是因为那个项目的rails的版本是4.0.0，你只要按照提示运行下命令：

    rake db:migrate RAILS_ENV=development

    就可以了。这时数据库会被重新创建，你需要重新加入数据。

    想更多了解，可以参考：https://github.com/rails/rails/issues/8025