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I have Rails 3.1.3 installed on my machine with Rake 0.9.2 . When I do gem list, I see both installed with the correct version but when I run rake db:migrate I get the error saying
Missing the Rails 3.1.3 gem. Please
gem install -v=3.1.3 rails,
update your RAILS_GEM_VERSION setting in config/environment.rb for the
Rails version you do have installed, or comment out RAILS_GEM_VERSION
to use the latest version installed.
Are you using bundler? If so, try using
bundler exec rake db:migrate.