Rails with Cassandra

I am trying to integrate Cassandra with Rails using the method described
this page,

I made a small change. I created a rails app with two variables, Name
Age. Name of the app is user.
After I did this,
I ran the rails server. Everything works fine except when I click on the
“create user” button. I receive the following error.

NameError (uninitialized constant RAILS_ENV):

app/controllers/users_controller.rb:46:in create' app/controllers/users_controller.rb:45:in create’

I am not able to trace the exact problem. How can I verify if the column
family I created in Cassandra is actually connected to the app.