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

Trying to give a somewhat more complete answer to the ones above: As mentioned in the devise_auth_token gem's documentation

...Additionally, you can configure other aspects of devise by manually creating the traditional devise.rb file at config/initializers/devise.rb. Here are some examples of what you can do in this file:

Devise.setup do |config|   
# The e-mail address that mail will appear to be sent from   
# If absent, mail is sent from "please-change-me-at-config-initializers-devise@example.com"  
config.mailer_sender = "support@myapp.com"

# If using rails-api, you may want to tell devise to not use ActionDispatch::Flash   
# middleware b/c rails-api does not include it.   
# See: http://stackoverflow.com/q/19600905/806956  
config.navigational_formats = [:json] end

I had the same problem, and like metioned here, I created the devise initializer, and add the config.secret_key = ENV['DEVISE_SECRET_KEY'] line to it.