Ruby on Rails 3 simple-navigation could not find in any of the sources

I've be using simple-navigation and it's working fine. I'开发者_JAVA百科ve just tried to do a database migration using:

rake db:migrate

and get the error:

test me$ rake db:migrate (in /Users/me/test) Could not find simple-navigation-3.2.0 in any of the sources Try running bundle install.

I've run bundle install and I have a working navigation in the application. Running the db migration is the only problem I'm having.

Any ideas?

---

Turns out it was a problem with my environment. I installed rvm and installed the latest version of Ruby and everything works fine now.