tad@lpfminer1:~/Rails_Applications/sample_app$ rails generate model User name:string email:string
      invoke  active_record
      create    db/migrate/20110913001345_create_users.rb
      create    app/models/user.rb
      invoke    rspec
      create      spec/models/user_spec.rb
tad@lpfminer1:~/Rails_Applications/sample_app$ rake db:migrate
rake aborted!
undefined method `prerequisites' for nil:NilClass

(See full trace by running task with --trace)
tad@lpfminer1:~/Rails_Applications/sample_app$ rake db:migrate --trace
rake aborted!
undefined method `prerequisites' for nil:NilClass
/home/tad/.rvm/gems/ruby-1.9.2-p290@sample_app/gems/rspec-rails-2.0.0/lib/rspec/rails/tasks/rspec.rake:3:in `<top (required)>'
/home/tad/.rvm/gems/ruby-1.9.2-p290@sample_app/gems/rspec-rails-2.0.0/lib/rspec-rails.rb:10:in `load'
/home/tad/.rvm/gems/ruby-1.9.2-p290@sample_app/gems/rspec-rails-2.0.0/lib/rspec-rails.rb:10:in `block in <class:Railtie>'
/home/tad/.rvm/gems/ruby-1.9.2-p290@sample_app/gems/railties-3.1.0/lib/rails/railtie.rb:183:in `call'
/home/tad/.rvm/gems/ruby-1.9.2-p290@sample_app/gems/railties-3.1.0/lib/rails/railtie.rb:183:in `block in load_tasks'
/home/tad/.rvm/gems/ruby-1.9.2-p290@sample_app/gems/railties-3.1.0/lib/rails/railtie.rb:183:in `each'