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

I cloned my repository onto a new machine from git. The

config/secrets.yml 

file was on my .gitignore list, so that file didn't exist, and Devise doesn't create the file.

I added the file, then re-ran

rails generate devise MODEL

and it worked.