运行Ruby时出错

Question

我刚开始学习rails并遇到了问题。我在rails console中写的任何东西都给了我这个：

NameError: undefined local variable or method `    ' for main:Object
from (irb):1
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-       4.0.3/lib/rails/commands/console.rb:90:in `start'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-4.0.3/lib/rails/commands/console.rb:9:in `start'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-4.0.3/lib/rails/commands.rb:62:in `<top (required)>'
from C:/Users/User/RubymineProjects/untitled7/bin/rails:4:in `require'
from C:/Users/User/RubymineProjects/untitled7/bin/rails:4:in `<top (required)>'
from -e:1:in `load'
from -e:1:in `<main>'

有谁知道如何解决这个问题？