Keep Coding

Any advise would help.
We have an active_record model and a concern defined as shown below.
When we start puma server locally, everything is working fine,
But when its deployed to Elastic BeanStalk web environment (64bit Amazon Linux 2016.03 v2.1.6 running Ruby 2.3 (Puma)), We get superclass mismatch error for User
We have tried commenting class User in the concern and deploy to Elastic BeanStalk, this worked fine. But we want to keep the way its mentioned below.
app/models/user.rb
------------------
class User < ActiveRecord::Base
include User::Authenticable
end
app/models/concerns/user/authenticable.rb
------------------------------------------
class User
module Authenticable
extend ActiveSupport::Concern
end
end
Error log:
/var/app/current/app/models/user.rb:1:in `<top (required)>': superclass mismatch for class User (TypeError)
from /opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require'
from /opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `block in r
equire'
from /opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_depen
dency'