Rails console error

Hi,
      I'm getting the following lines when I tried to open rails
console:

/home/rahul/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/test/unit/
assertions.rb:6:in `<top (required)>': Test is not a module
(TypeError)

Please help me how to correct it.

Thanks in advance.

Regards,
Rahul