rake db:migrate aborted

I'm reading the rails tutorial book and in chapter 6 page 199 I have to make a rake db:migrate, but I get this error:

rake aborted! undefined method `prerequisites' for nil:NilClass

(See full trace by running task with --trace)

When I try with rake db:migrate --trace I get the following errors:

rake aborted! undefined method `prerequisites' for nil:NilClass /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rspec-rails-2.0.1/lib/ rspec/rails/tasks/rspec.rake:3:in `<top (required)>' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rspec-rails-2.0.1/lib/ rspec-rails.rb:10:in `load' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rspec-rails-2.0.1/lib/ rspec-rails.rb:10:in `block in <class:Railtie>' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/ rails/railtie.rb:183:in `call' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/ rails/railtie.rb:183:in `block in load_tasks' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/ rails/railtie.rb:183:in `each' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/ rails/railtie.rb:183:in `load_tasks' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/ rails/engine.rb:396:in `block in load_tasks' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/ rails/application/railties.rb:8:in `each' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/ rails/application/railties.rb:8:in `all' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/ rails/engine.rb:396:in `load_tasks' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/ rails/application.rb:103:in `load_tasks' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/ rails/railtie/configurable.rb:30:in `method_missing' /Users/jeanosorio/ror/sample_app/Rakefile:7:in `<top (required)>' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/ rake_module.rb:25:in `load' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/ rake_module.rb:25:in `load_rakefile' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/ application.rb:495:in `raw_load_rakefile' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/ application.rb:78:in `block in load_rakefile' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/ application.rb:129:in `standard_exception_handling' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/ application.rb:77:in `load_rakefile' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/ application.rb:61:in `block in run' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/ application.rb:129:in `standard_exception_handling' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/lib/rake/ application.rb:59:in `run' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/gems/rake-0.9.2/bin/rake: 32:in `<top (required)>' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/bin/rake:19:in `load' /Users/jeanosorio/.rvm/gems/ruby-1.9.2-p290/bin/rake:19:in `<main>'

I tried update my gems, but I still get the last error. Can anybody help me to solve this issues please.

try gem install rake

i am not sure, if this works for others or not. as i am beginner. but it worked for me.