I\'m running Ruby 2.5.1 and Rails 5.2.0. I ran rails s -e production, and it gives this error:
rails s -e production
/home/roy/.rbenv/versions/2.5.1/lib/ruby/gems/2.5
You need to ask for the master key to you project leader / team leader / coworkers.
With that long key like 63y4gh47373h3733jj474 you copy it and paste it the master.key file under config folder.
That solve the issue.