heroku rake db:migrate, rake aborted! undefined method 'task'

When i run: heroku rake db:migrate,

I get t开发者_StackOverflow社区his error message:

 rake aborted!
 undefined method 'task' for #<'Myapp::Application:0x7f07c011f4f8>

I'm running rake 0.8.7 and have uninstalled rake 0.9.

Also, when i add --trace, these files come up:

/app/.bundle/gems/ruby/1.8/gems/railties-3.0.7/lib/rails/application.rb
/app/.bundle/gems/ruby/1.8/gems/rake-0.9.0/lib/rake/rake_module.rb
/app/.bundle/gems/ruby/1.8/gems/rake-0.9.0/lib/rake/application.rb

(sorry for not being exact, I can't copy n paste, I'm running windows)

So, im guessin the rake-0.9.0 file that comes up is the culprit :S, but i dunno how to deal with it.

Thanks in advance

---

You could try specifying the exact version of rake in your Gemfile:

gem 'rake', '~> 0.8.7'

This won't work if you have any dependencies relying on rake 0.9, of course.