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

One other way that worked for me was, went to the Gemfile.lock and changed Rake version from 0.9.2.2 to 0.9.3.beta.1.