Devise Secret Key was not set

Question

I am developing a Rails 4 app using the Active Admin gem for the administration back end. Active Admin in turn uses Devise for user authentication. Now, when I try to deploy

Answer 1

Ran into the same trouble with Rails 5.2.0 and Devise 4.4.1

Drop the following into /config/initializers/devise.rb

config.secret_key = Rails.application.credentials.secret_key_base