When adding devise_invitable to my Gemfile, I get this error when doing bundle install.
$ bundle install
Fetching source index for http://rubygems.org/
Bundler could not find compatible versions for gem "rails":
In Gemfile:
devise_invitable (~> 0.4.0) depends on
rails (~> 3.0.0)
rails (3.1.0)
In your
Gemfile, updatedevise_invitableto use a newer version (current is 0.5.4) instead of 0.4.0; 0.5.4 supports Rails 3.1.