Error stating that “bcrypt-ruby is not part of the bundle”, how can I add bcrypt-ruby to Gemfile?

Question

When I add has_secure_password to the model (inherited from ActiveRecord::Base), error stating that \"bcrypt-ruby is not part of the bundle\" occurs.

Here the log is

Answer 1

Restart the server and reinstall bundle in correct order, that is:

bundle install, bundle update, bundle install

and then server restart.