Troubles running rspec

developing a 3.1 app. trying to run spec on and get this error:

bundle exec rake spec

DEPRECATION WARNING: you are using a deprecated constant that will
be removed from a future version of RSpec.

runtime.rb:68:in `require’

  • Rspec is deprecated.
  • RSpec is the new top-level module in RSpec-2

[DEPRECATION WARNING] Nested I18n namespace lookup under
“activerecord.attributes.order” is no longer supported
/home/slava/.rvm/rubies/ruby-1.9.2-p290/bin/ruby -S bundle exec
rspec ./spec/models/derivative_spec.rb
rails.rb:15:in <top (required)>': undefined methodjoin’ for
nil:NilClass (NoMethodError)
from /home/slava/.rvm/gems/ruby-1.9.2-p290/gems/

never mind. I didn’t run rails generate rspec:install