rake aborted! undefined method `migration_error=' for ActiveRecord::Base:Class

Question

I am developing project on Ruby on Rails Till the present moment I used Rails 4 and everything was fine before I faced incapability issues with gems. I decided to rollback t

Answer 1

Try:

bundle exec rake db:migrate

Answer 2

Rolling a Rails 4 project back to Rails 3 caused this error for me. Deleting the following line from config/environments/development.rb fixed the issue:

config.active_record.migration_error = :page_load