Deactivate a Gem - “you have already activated rake 0.9.3.beta.1, but my Gemfile requires rake 0.9.2”

Question

I\'m trying to run a migration but I keep getting the error message that is:

rake aborted! Undefined method prerequisite for nil:NilClass.

It s

Answer 1

Try to remove your Gemfile.lock file and run bundle install again.