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.
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