rails安装问题

Question

本人环境：linuxmint 15 已经用rvm安装好了ruby2.0，也通过gem安装好了rails4.0 但是使用rails new .的时候就报错，甚至rails -v也不行

报错信息:

/home/sergio/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require': cannot load such file -- /home/sergio/config/boot (LoadError)
    from /home/sergio/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
    from script/rails:5:in `<main>'

网上找了下没答案，实在不知道怎么办了。。