It is an issue with your version of you rake gem.  Check out the
answer here: 
http://stackoverflow.com/questions/6085610/rails-rake-problems-uninitialized-constant-rakedsl

On Jul 14, 2:51 pm, Manu Bangia <[email protected]> wrote:
> Hi,
>
> I am on section 7.4.2 of the tutorial. However when I try to migrate my
> heroku database, i get the following error:
>
> C:\Users\Manu\Documents\Manu\ruby\sample_app>heroku rake db:migrate
> (in /app)
> rake aborted!
> uninitialized constant Rake::DSL
> /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2482:in `const_missing'
> /app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/tasklib.rb:8:in
> `<class:Ta
> skLib>'
> /app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/tasklib.rb:6:in
> `<module:R
> ake>'
> /app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/tasklib.rb:3:in `<top
> (req
> uired)>'
> /app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/rdoctask.rb:20:in
> `require
> '
> /app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/rdoctask.rb:20:in
> `<top (r
> equired)>'
> /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.7/lib/rails/tasks/documentat 
> ion.r
> ake:1:in `require'
> /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.7/lib/rails/tasks/documentat 
> ion.r
> ake:1:in `<top (required)>'
> /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:15:in
> `load'
>
> /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:15:in
> `block
>  in <top (required)>'
> /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:6:in
> `each'
> /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:6:in
> `<top (
> required)>'
> /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:2 
> 14:in
>  `require'
> /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:2 
> 14:in
>  `initialize_tasks'
> /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:1 
> 39:in
>  `load_tasks'
> /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:7 
> 7:in
> `method_missing'
> /app/Rakefile:7:in `<top (required)>'
> /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2373:in `load'
> /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2373:in `raw_load_rakefile'
> /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2007:in `block in load_rakefile'
> /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2058:in `standard_exception_handling'
> /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2006:in `load_rakefile'
> /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:1991:in `run'
> /usr/ruby1.9.2/bin/rake:31:in `<main>'
>
> Any ideas?

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